Have you ever typed the word occurrence and stopped to wonder how many r’s or c’s it should have? The spelling of Occurrence or Occurence can be tricky because the incorrect form looks almost identical to the correct one. However, there is a simple spelling rule that can help you remember which version to use.
Occurrence is the correct spelling, while occurence is a common misspelling. The word occurrence refers to something that happens, an event, or an instance of something happening. Unlike spelling differences such as American and British English, this one does not change based on the variety of English you use. Occurrence is the standard spelling in both American and British English.
Examples:
- The accident was an unusual occurrence.
- Power outages are a common occurrence during severe storms.
The confusion is understandable. People often search for occurrence or occurence, occurrence vs occurence, which spelling is correct, or occurence meaning in English because the word contains repeated letters that are easy to mix up. And here’s the kicker: occurence is not an accepted alternative spelling. The correct form is occurrence, with two c’s and two r’s.
In this guide, you’ll learn the complete difference between Occurrence or Occurence, including the meaning, pronunciation, origin, correct spelling, and usage. You’ll also discover why occurence is commonly misspelled and see clear examples to help you remember the correct spelling.
Occurrence or Occurence: What Is the Correct Spelling?
When you’re choosing between occurrence and occurence, there isn’t a difference between American and British spelling. Occurrence is the standard spelling in both varieties of English.
The incorrect form occurence drops the second r.
| Word | Correct? | Reason |
| Occurrence | ✅ Yes | Standard English spelling |
| Occurence | ❌ No | Missing the second r |
| Occur | ✅ Yes | Correct base verb |
| Occurred | ✅ Yes | Correct past tense |
| Occurring | ✅ Yes | Correct present participle |
The easiest way to remember the spelling is to look at the base word:
occur → occurrence
The first part already contains cc, while the r pattern continues into the noun. That gives you:
o-c-c-u-r-r-e-n-c-e
There are two c’s and two r’s.
That small detail makes a big difference.
Why Is Occurrence Spelled With Double R?
The spelling becomes easier to understand once you connect occurrence to occur.
The verb occur means to happen, take place, exist, appear, or come to mind. When English forms the noun occurrence, the word retains the important spelling pattern associated with the base word.
Think of the relationship this way:
occur → occurrence
You can also remember it as:
occur + -rence → occurrence
The second r is the letter that writers most often lose.
For example:
- The accident was an unusual occurrence. ✅
- The accident was an unusual occurence. ❌
The incorrect version may look natural because English contains many nouns ending in -ence. Words such as difference, existence, and importance don’t have this particular double-r pattern.
However, occurrence is tied closely to occur, so keeping the spelling connection in mind helps.
A Simple Spelling Trick
Use this sentence:
Something that occurs is an occurrence.
The two words share the same core spelling:
- occur
- occurrence
If you can spell occur correctly, you have a strong starting point for spelling occurrence.
Another useful visual trick is to remember:
Two C’s + two R’s = occurrence
That gives you the key letters to check before you submit an essay, report, email, or article.
What Does Occurrence Mean?
Occurrence is a noun that generally refers to something that happens or exists.
It has two closely related uses.
First, it can describe an event, happening, or incident.
For example:
The power outage was an unexpected occurrence.
Here, occurrence refers to the event itself.
Second, it can refer to the fact or degree of something existing or happening.
For example:
Researchers studied the occurrence of the disease in different regions.
In this sentence, the word isn’t simply naming one event. It refers to the presence or frequency of the disease in those regions.
This distinction matters in academic and scientific writing because occurrence often describes patterns, rates, or the presence of something.
Occurrence as a Happening
In everyday English, occurrence often means an event or something that happens.
For example:
- The delay was an unexpected occurrence.
- Power cuts are a common occurrence during severe storms.
- The accident was a rare occurrence.
- Such mistakes are an everyday occurrence in busy workplaces.
In these sentences, you could often replace occurrence with event or happening. However, occurrence can sound more formal.
Occurrence as Existence or Presence
In academic, medical, scientific, and technical writing, occurrence can describe the presence or frequency of something.
For example:
The researchers examined the occurrence of certain minerals in the region.
Here, occurrence refers to where or how something exists.
You might also see phrases such as:
- occurrence of disease
- occurrence of minerals
- occurrence of errors
- occurrence of symptoms
- occurrence of rainfall
- occurrence of natural phenomena
This use gives the word a broader meaning than simply “event.”
Occurrence in a Sentence: Examples
Seeing the word in different contexts makes its meaning much clearer.
Everyday Examples
- Traffic jams are a common occurrence in large cities.
- Forgetting your keys is an occasional occurrence.
- The sudden noise was an unusual occurrence.
- Rain in the afternoon is a regular occurrence during the season.
- Their disagreement was an unfortunate occurrence.
Academic Examples
- The study examined the occurrence of sleep problems among students.
- Researchers measured the occurrence of errors in the experiment.
- The paper discusses the occurrence of the species in coastal regions.
- Scientists are studying the occurrence of earthquakes along the fault.
- The research found a lower occurrence of the condition in the control group.
Workplace Examples
- Technical problems are a rare occurrence with the new system.
- The manager documented each occurrence of equipment failure.
- Such delays have become a frequent occurrence.
- The company tracks the occurrence of workplace incidents.
Formal Examples
- The committee investigated the occurrence of several irregularities.
- The report describes the occurrence of flooding in the region.
- The incident was an isolated occurrence.
- Officials recorded several similar occurrences over the following months.
Notice how the word fits naturally into both casual and formal contexts. The surrounding words determine how formal it feels.
Common Phrases With Occurrence
Some combinations with occurrence appear much more often than others. Learning these phrases can make your writing sound more natural.
Common Occurrence
A common occurrence is something that happens frequently or isn’t unusual.
Traffic delays are a common occurrence during rush hour.
Everyday Occurrence
An everyday occurrence is something that happens regularly as part of normal life.
Checking email has become an everyday occurrence for many workers.
Rare Occurrence
A rare occurrence happens infrequently.
Snow is a rare occurrence in that region.
Frequent Occurrence
A frequent occurrence happens often.
Software updates have become a frequent occurrence on the device.
Regular Occurrence
A regular occurrence happens repeatedly at predictable or fairly consistent intervals.
Weekly meetings are a regular occurrence at the company.
Natural Occurrence
A natural occurrence happens naturally rather than being deliberately created.
Lightning is a natural occurrence during thunderstorms.
Unexpected Occurrence
An unexpected occurrence is something that happens without being anticipated.
The sudden closure was an unexpected occurrence.
Chance Occurrence
A chance occurrence is something that happens randomly or by coincidence.
The researchers considered the result a possible chance occurrence.
Occurrence vs Occur
The words occur and occurrence are closely related, but they perform different grammatical jobs.
Occur is a verb.
Occurrence is a noun.
Compare these sentences:
The accident occurred yesterday.
The accident was a serious occurrence.
In the first sentence, occurred tells you what happened.
In the second, occurrence names the event.
| Word | Part of speech | Meaning | Example |
| occur | Verb | To happen or exist | The problem may occur again. |
| occurs | Verb | Happens or exists | The problem occurs frequently. |
| occurred | Verb | Happened or existed | The error occurred yesterday. |
| occurring | Verb form | Happening or existing | The problem is occurring again. |
| occurrence | Noun | Something that happens or exists | The error was an unusual occurrence. |
| occurrences | Noun | More than one occurrence | Several occurrences were recorded. |
This distinction is especially useful when you’re editing your writing. If you’re describing what happens, you probably need occur. If you’re naming the thing that happened, you may need occurrence.
Occurrence vs Event
Occurrence and event overlap in meaning, but they aren’t always interchangeable.
An event usually refers to something that happens. It can also describe a planned activity, such as a concert, meeting, wedding, or conference.
For example:
The company organized a charity event.
You wouldn’t normally replace event with occurrence here.
However:
The power failure was an unusual occurrence.
In this context, occurrence works naturally because the word emphasizes something that happened.
The difference becomes clearer with planned activities.
| Word | Typical use |
| Event | A happening, especially something planned or organized |
| Occurrence | Something that happens, often unexpectedly, unusually, or repeatedly |
So, a conference is an event. A sudden technical failure is an occurrence.
Of course, some situations allow both words. Context determines which sounds more natural.
Occurrence vs Incident
Incident usually refers to a particular event, especially one that is unusual, problematic, or worth reporting.
For example:
The security team investigated the incident.
You could say:
The security team investigated the occurrence.
But the meaning shifts slightly.
Incident often draws attention to the specific event and its circumstances. Occurrence is broader and can sound more neutral.
Compare:
The argument was an unfortunate incident.
The argument was an unfortunate occurrence.
The first sounds more like a specific episode. The second focuses more generally on the fact that it happened.
In workplace, legal, safety, and security contexts, incident often has a more specialized role.
Occurrence vs Occasion
Occurrence and occasion look somewhat similar, but they don’t mean the same thing.
An occurrence is something that happens or exists.
An occasion can mean a particular time, situation, or event. It can also refer to a special event.
For example:
The accident was a rare occurrence.
But:
The wedding was a special occasion.
You wouldn’t normally switch those words.
Consider another pair:
On one occasion, she arrived early.
Her early arrival was an unusual occurrence.
The first sentence focuses on a particular instance or time. The second focuses on the fact that something happened.
Is Occurrence a Countable or Uncountable Noun?
Occurrence can function as both a countable and an uncountable noun depending on how you use it.
When you’re talking about a specific event or happening, it is usually countable.
That was an unusual occurrence.
We recorded three separate occurrences.
Several occurrences were reported.
When you’re talking about the fact or degree of something happening or existing, it can be uncountable.
The study examined the occurrence of heart disease.
Researchers investigated the occurrence of errors in the system.
This distinction is useful because it explains why both of these patterns are correct:
an occurrence
and
the occurrence of something
The surrounding context tells you which sense you’re using.
What Is the Plural of Occurrence?
The plural of occurrence is occurrences.
You simply add -s:
occurrence → occurrences
For example:
- One occurrence
- Two occurrences
- Several occurrences
- Multiple occurrences
- Repeated occurrences
Occurrence vs Occurrences
Use occurrence when referring to one event or instance:
The error was an isolated occurrence.
Use occurrences when referring to more than one:
The report lists five similar occurrences.
Be careful not to change the spelling incorrectly when making the word plural. The double r remains:
occurrences
Not:
occurences
The plural doesn’t remove any of the letters from the singular form.
Common Spelling Mistakes Related to Occur
The word occur creates several spelling traps because its forms don’t always look as simple as they sound.
The main forms are:
| Form | Correct spelling |
| Base form | occur |
| Third-person singular | occurs |
| Past tense | occurred |
| Present participle | occurring |
| Noun | occurrence |
| Plural noun | occurrences |
The biggest pattern to notice is the double r in the past tense and present participle:
occur → occurred → occurring
The noun also contains the double r:
occurrence
The spelling of occur itself contains double c:
o-c-c-u-r
So the word family gives you a useful visual pattern.
Occur, Occurred, and Occurring
These three forms deserve special attention.
Occur:
Problems sometimes occur without warning.
Occurred:
The problem occurred during the update.
Occurring:
The problem is occurring more frequently.
The double r remains when -ed or -ing is added.
That’s why these spellings are correct:
- occurred
- occurring
And these are incorrect:
- occured
- occuring
The same spelling awareness helps with occurrence.
Why Do People Spell Occurrence as Occurence?
The misspelling occurence is easy to understand. It looks plausible.
English has many nouns ending in -ence, and writers often remember the sound of a word better than every letter in it. When people write occurence, they may unconsciously treat the word as:
occur + ence
The problem is that this loses an r.
The correct spelling is:
occurrence
One practical solution is to avoid memorizing the noun as an isolated string of letters. Instead, connect it to its base:
occur → occurrence
That relationship gives the spelling a logical anchor.
A Useful Memory Sentence
Try this:
What occurs is an occurrence.
The phrase connects the verb and noun in one short sentence.
You can also use:
Occurrence has two C’s and two R’s.
That isn’t a rule for every related word in English. It’s simply a convenient spelling check for this particular word.
How to Spell Occurrence Correctly
If you’re unsure while writing, use this quick process.
Start With Occur
Write:
occur
Then remember that the noun is:
occurrence
Check the Double C
The beginning contains:
occ
Not:
oc
Check the Double R
The middle contains:
rr
Not:
r
Check the Ending
The word finishes with:
ence
Put it together:
o + cc + u + rr + ence
occurrence
That simple visual breakdown can prevent the most common spelling mistake.
Is Occurence Ever Correct?
No. Occurence is not the standard English spelling of the noun.
If you’re writing in standard American English, use occurrence.
The same applies to formal writing such as:
- Academic papers
- Business reports
- Resumes
- Emails
- Articles
- School assignments
- Technical documentation
- Legal documents
A spell-checker may catch occurence, but it’s better to know the correct form yourself. Spell-checking tools don’t always catch every error, especially when a misspelled word resembles a legitimate word pattern.
Occurrence in Academic and Scientific Writing
The word becomes particularly useful in research because it can describe the presence, rate, or distribution of something.
For example:
The study examined the occurrence of respiratory illness across different age groups.
Here, occurrence doesn’t simply mean one isolated incident. It describes the presence or frequency of the condition within a population.
Scientific and academic writing often uses constructions such as:
- occurrence of disease
- occurrence of errors
- occurrence of mutations
- occurrence of symptoms
- occurrence of species
- occurrence of minerals
- occurrence of natural phenomena
This is one reason the word appears frequently in research and technical contexts.
Consider the difference:
Researchers studied disease.
This is broad.
Researchers studied the occurrence of disease.
This tells the reader that the study concerns the presence or frequency of disease.
The second sentence provides a more specific relationship between the research and its subject.
Occurrence in Legal and Insurance Language
Occurrence also has a specialized meaning in legal and insurance contexts.
In ordinary English, an occurrence is simply something that happens. In insurance language, however, occurrence can refer to an accident, event, or continuing condition that causes unintended or unexpected damage.
That specialized use matters because legal and insurance documents often assign precise meanings to otherwise ordinary words.
For example, an insurance policy might discuss whether damage resulted from a particular occurrence. The exact definition depends on the policy and jurisdiction.
So, if you’re reading a contract or insurance policy, don’t automatically assume that occurrence has only its everyday meaning. Legal terminology can be narrower and more technical.
Occurrence in Different Types of Writing
The word works across many types of writing, but its tone changes slightly depending on the context.
| Context | Example |
| Everyday | Traffic delays are a common occurrence. |
| Business | The report documented each occurrence of system failure. |
| Academic | The study examined the occurrence of the condition. |
| Scientific | Researchers measured the occurrence of the species. |
| News | Officials described the incident as an isolated occurrence. |
| Legal | The policy defines an occurrence in specific terms. |
| Technical | The software logs each occurrence of an error. |
This versatility makes occurrence useful when you need a noun for something that happens or exists without sounding overly casual.
Occurrence vs Occur: A Quick Grammar Test
Here’s an easy test you can use when editing.
If the word needs to describe something happening, try occur.
The problem may occur again.
If you need to name the happening itself, try occurrence.
The problem was an unusual occurrence.
This isn’t a perfect substitution test for every sentence, but it works well in many common situations.
Another useful clue is the word before it.
If you see:
- an occurrence
- the occurrence
- this occurrence
- several occurrences
- a common occurrence
- a rare occurrence
you’re almost certainly dealing with the noun.
A Closer Look at the Word’s History
The history of occurrence helps explain why the word has the form it does.
The word ultimately traces back to Latin occurrere, meaning roughly “to run to meet,” “run against,” or “present itself.” English later developed occur from this Latin source.
Merriam-Webster gives the first known use of occurrence as 1539, while the verb occur dates to the 15th century.
Over time, the meaning moved from the idea of something presenting itself or coming into one’s path to the modern senses of something happening, appearing, existing, or coming to mind.
That history also explains why occur has several related meanings today.
For example:
A problem occurred.
means a problem happened.
But:
The species occurs naturally in this region.
means the species exists or is found there.
And:
It occurred to me that I had forgotten my keys.
means an idea came into your mind.
The noun occurrence grows out of this same word family.
Occurrence: Common Collocations to Remember
A collocation is a combination of words that naturally tend to appear together.
Learning common collocations can help you use occurrence more confidently.
adjective + occurrence combinations
- common occurrence
- everyday occurrence
- frequent occurrence
- regular occurrence
- rare occurrence
- unusual occurrence
- unexpected occurrence
- natural occurrence
- isolated occurrence
- widespread occurrence
- repeated occurrence
- daily occurrence
verb + occurrence combinations
- prevent an occurrence
- reduce an occurrence
- increase the occurrence
- record an occurrence
- report an occurrence
- document an occurrence
- investigate an occurrence
- monitor an occurrence
Common preposition patterns
The most useful patterns include:
occurrence of + noun
The researchers studied the occurrence of flooding.
occurrence in + place or group
The study examined the occurrence of the disease in rural communities.
occurrence among + group
Researchers measured the occurrence of the condition among adults.
These patterns are especially valuable in formal and academic writing.
Quick Comparison: Occurrence, Event, Incident, and Occasion
These four words can overlap, but each has its own typical use.
| Word | Core meaning | Example |
| Occurrence | Something that happens or exists | The outage was an unusual occurrence. |
| Event | Something that happens or a planned activity | The conference was a major event. |
| Incident | A particular event, often unusual or problematic | The security team investigated the incident. |
| Occasion | A particular time, circumstance, or special event | The wedding was a memorable occasion. |
When you’re talking about something that simply happened, occurrence is often a safe and natural choice.
However, don’t use it automatically. If you’re talking about a concert, conference, wedding, or other organized gathering, event or occasion may be more precise.
Common Errors With Occurrence
Here are some mistakes worth checking for during proofreading.
❌ Occurence
Correct: occurrence
The incorrect version has only one r in the middle.
❌ Occured
Correct: occurred
The past tense keeps the double r.
❌ Occuring
Correct: occurring
The present participle also keeps the double r.
❌ Occurances
Correct: occurrences
The plural form retains both the double r and the double c.
Correct Word Family
Keep this group together:
occur → occurs → occurred → occurring → occurrence → occurrences
Once you recognize the pattern, these spellings become much easier to remember.
A Practical Editing Example
Imagine you’re proofreading this sentence:
The power failure was an unusual occurence, but similar problems occured twice last month.
At first glance, the sentence looks fine because both incorrect spellings resemble familiar English words.
Now correct the word family:
The power failure was an unusual occurrence, but similar problems occurred twice last month.
The correction becomes easier when you recognize that both words belong to the same occur family.
This is a useful proofreading habit. When one spelling looks uncertain, check related forms rather than treating the word as an isolated item.
Is Occurrence Formal or Casual?
Occurrence is neutral to formal.
You can use it in everyday conversation:
That’s a strange occurrence.
However, it often appears more naturally in formal, academic, technical, and professional writing.
In casual conversation, people may prefer simpler alternatives such as:
- thing that happened
- event
- incident
- happening
For example:
That was a strange thing that happened.
sounds more conversational than:
That was a strange occurrence.
Neither is wrong. The choice depends on your audience and tone.
When Should You Use Occurrence?
Use occurrence when you need a noun meaning something that happens or exists.
It’s particularly useful when:
- You want to describe an event without using event repeatedly.
- You want to emphasize that something happens regularly.
- You’re discussing the frequency or presence of something.
- You’re writing an academic or scientific report.
- You’re describing an unusual or unexpected happening.
- You’re discussing patterns across a population, location, or period.
- You need a neutral noun for something that happened.
For example:
Power outages are a frequent occurrence in the region.
The word works because the sentence discusses a repeated type of event.
When Another Word May Be Better
Although occurrence is correct, it isn’t always the strongest choice.
Use event when you mean a planned activity:
The university hosted a fundraising event.
Use incident when you mean a particular episode, especially one involving a problem:
The police investigated the incident.
Use occasion when you’re referring to a particular time or special event:
It was a memorable occasion.
Use happening when you want a casual, conversational tone:
Strange things were happening all night.
Good writing isn’t just about choosing a correct word. It’s about choosing the most precise and natural word for the sentence.
Frequently Asked Questions About Occurrence or Occurence
Is occurrence the correct spelling?
Yes. Occurrence is the correct standard English spelling. Occurence is a misspelling.
How do you spell occurrence?
Spell it:
O-C-C-U-R-R-E-N-C-E
The word contains two c’s and two r’s.
Is occurence ever correct?
No. Occurence is not the standard spelling. Use occurrence instead.
What does occurrence mean?
Occurrence means something that happens or exists. It can describe a particular event or the fact that something happens or exists.
What is the plural of occurrence?
The plural is occurrences.
For example:
Several unusual occurrences were reported.
Is occurrence a noun?
Yes. Occurrence is a noun.
The related verb is occur.
The accident occurred yesterday.
The accident was an unusual occurrence.
What is an example of occurrence?
A power outage is a common occurrence during severe storms.
Here, occurrence means an event that happens.
Does occurrence have two r’s?
Yes. Occurrence contains two r’s and two c’s:
occurrence
That’s one of the easiest ways to check the spelling.
What is the difference between occur and occurrence?
Occur is a verb meaning to happen, exist, or come to mind. Occurrence is a noun referring to something that happens or exists.
The problem may occur again.
The problem was an unusual occurrence.
Is occurrence used in academic writing?
Yes. Occurrence is common in academic and scientific writing, especially when discussing the presence, frequency, or distribution of something.
The study examined the occurrence of the disease across several regions.
Final Answer: Occurrence or Occurence?
When you’re deciding between occurrence and occurence, choose occurrence every time in standard English.
Occurrence is the correct spelling.
Occurence is incorrect because it drops the second r.
The easiest way to remember it is to connect the noun to its base verb:
occur → occurrence
Then check the two important letter pairs:
cc + rr
So the correct spelling is:
occurrence
Once you remember that something that occurs is an occurrence, the spelling becomes much harder to forget.
