If you are unsure about criteria or criterion, the short answer is simple: criterion is singular, and criteria is plural.
Many writers use these words interchangeably because “criteria” appears more often in business, academic, and everyday writing. However, using the wrong form can make a sentence grammatically incorrect. This guide explains the difference, when to use each word, common mistakes to avoid, and practical examples that make the rule easy to remember.
For more grammar and usage guidance, see our complete guide to correct word usage in English.
Why Criteria And Criterion Are Frequently Confused
The confusion comes from the fact that English borrowed these words from Greek. Unlike many English nouns that form plurals by adding -s, criterion changes to criteria.
Because criteria appears so frequently in workplaces, schools, and online content, many people mistakenly assume it is singular.
Common reasons for confusion include:
- Criteria sounds singular to many speakers.
- Criterion is less commonly used in everyday conversation.
- Some people incorrectly use “criterias” as a plural.
- Business documents often use criteria even when referring to one requirement.
What Criterion Refers To In English Grammar
A criterion is a single standard, rule, or requirement used to judge something.
Think of criterion as meaning one condition or one measure.
Correct Examples
- Cost is an important criterion when buying a house.
- Accuracy was the main criterion for selecting the winner.
- Safety remains the primary criterion in product testing.
Incorrect Examples
❌ Cost is an important criteria when buying a house.
❌ Accuracy was the main criteria for selecting the winner.
A quick memory trick:
| Singular | Meaning |
| Criterion | One standard or requirement |
What Criteria Refers To In English Grammar
Criteria is the plural form of criterion. It refers to multiple standards, conditions, or requirements.
When several factors are being considered, criteria is the correct choice.
Correct Examples
- The hiring criteria include education, experience, and communication skills.
- These criteria must be met before approval.
- The judging criteria were clearly explained.
Incorrect Examples
❌ The hiring criterion include education, experience, and communication skills.
❌ These criterion must be met before approval.
| Plural | Meaning |
| Criteria | Multiple standards or requirements |
Criteria Vs Criterion In Singular And Plural Usage
The distinction is entirely about number.
| Word | Singular Or Plural | Example |
| Criterion | Singular | Price is one criterion. |
| Criteria | Plural | Price and quality are important criteria. |
Notice how the verb changes too:
- The criterion is important.
- The criteria are important.
This same singular-versus-plural distinction appears in many grammar pairs, such as math or maths and mom or mum, where usage depends on context and language conventions.
When To Use Criteria And When To Use Criterion
A simple question can help:
Are you talking about one requirement or several?
Use criterion when referring to:
- One standard
- One condition
- One requirement
- One factor
Use criteria when referring to:
- Multiple standards
- Multiple conditions
- Multiple requirements
- Multiple factors
Quick Test
| Sentence | Correct Word |
| Cost is one _____ for selection. | Criterion |
| Cost and quality are important _____. | Criteria |
Is It Criteria Or Criterion For Success?
The correct choice depends on the number of standards involved.
Use Criterion For Success
If there is only one measure:
- Consistency is the main criterion for success.
- Customer satisfaction is the primary criterion for success.
Use Criteria For Success
If there are multiple measures:
- Revenue growth and retention are key criteria for success.
- The company established several criteria for success.
One Of The Criteria Or One Of The Criterion?
The correct phrase is:
✅ One of the criteria
Why?
The expression one of the always refers to a member of a larger plural group.
Examples:
- One of the criteria is reliability.
- One of the criteria was affordability.
Incorrect:
❌ One of the criterion
This follows the same pattern seen in many commonly confused word choices, including shrank or shrunk and dove or dived, where grammatical structure determines the correct form.
Each Criteria Or Each Criterion?
The correct expression is:
✅ Each criterion
The word each requires a singular noun.
Examples:
- Each criterion has a specific purpose.
- Each criterion must be evaluated separately.
Incorrect:
❌ Each criteria must be evaluated.
Remember:
| Expression | Correct? |
| Each criterion | Yes |
| Each criteria | No |
These Criteria Or This Criterion?
Demonstrative pronouns must match the noun.
Correct Pairings
- This criterion
- That criterion
- These criteria
- Those criteria
Examples:
✅ This criterion is essential.
✅ These criteria are essential.
Incorrect:
❌ These criterion are essential.
❌ This criteria is essential.
Is Criterias Correct?
No.
Criterias is considered nonstandard and grammatically incorrect in formal English.
Because criterion comes from Greek, its accepted plural form is criteria.
Correct Forms
- Criterion
- Criteria
Incorrect Form
- Criterias
This mistake is similar to using the wrong standard form in comparisons such as spelled or spelt and while or whilst.
Acceptance Criteria Or Acceptance Criterion In Professional Writing
In project management, software development, and business documentation, acceptance criteria is far more common.
The reason is simple: projects typically have multiple requirements that must be satisfied.
Acceptance Criterion
Used when discussing a single requirement.
Example:
- Response time is an acceptance criterion for the system.
Acceptance Criteria
Used when discussing multiple requirements.
Example:
- Security, performance, and usability are acceptance criteria for the application.
Criteria Vs Criterion In UK And US English
There is no meaningful difference between US English and UK English regarding these words.
Both varieties use:
- Criterion as singular
- Criteria as plural
American publications, academic institutions, and style guides follow the same rule as British publications.
This differs from usage distinctions seen in topics like will or would or disorganized or unorganized, where context and meaning can shift significantly.
Where Criterion And Criteria Come From
The word criterion originates from Greek kriterion, meaning a means of judging or deciding.
Its plural form, criteria, entered English through Latin and has remained the accepted plural form for centuries.
Many English words with classical origins keep unusual plural forms.
Examples include:
| Singular | Plural |
| Criterion | Criteria |
| Phenomenon | Phenomena |
| Datum | Data |
| Analysis | Analyses |
Understanding the origin helps explain why adding -s to create “criterias” is incorrect.
Criterion And Criteria In Real-World Sentences
Seeing the words in context often makes the distinction easier.
Criterion Examples
- Affordability was the main criterion.
- Experience remains an important criterion.
- Safety is our top criterion.
Criteria Examples
- The selection criteria were published online.
- All criteria must be satisfied before approval.
- The scholarship criteria include academic achievement and leadership.
Comparison
| Correct Usage |
| One criterion |
| Several criteria |
| Each criterion |
| These criteria |
| One of the criteria |
Top Grammar Mistakes Involving Criteria And Criterion
Writers commonly make the following errors.
Using Criteria As Singular
❌ The criteria is important.
✅ The criterion is important.
Using Criterion As Plural
❌ The criterion are listed below.
✅ The criteria are listed below.
Using Criterias
❌ The criterias were explained.
✅ The criteria were explained.
Mixing Singular And Plural Agreement
❌ This criteria is required.
✅ This criterion is required.
If grammar distinctions interest you, compare similar usage questions such as master’s or masters apostrophe rules.
Final Clarity On Criteria Or Criterion
The rule is straightforward:
- Criterion = singular
- Criteria = plural
Use criterion when referring to one standard, requirement, or condition. Use criteria when referring to two or more standards, requirements, or conditions.
Most mistakes happen because criteria appears more frequently in everyday writing. Once you remember that criterion means one and criteria means many, choosing the correct form becomes much easier.
Common Questions About Criteria Or Criterion
What Is The Difference Between Criterion And Criteria?
Criterion is singular. Criteria is plural.
Is Criteria The Same As Criterion?
No. Criterion refers to one standard, while criteria refers to multiple standards.
What Does Criterion Mean?
A criterion is a rule, standard, or requirement used to evaluate something.
When Would You Use Criterion?
Use criterion when discussing one condition or standard.
What Is An Example Of A Criterion?
“Safety was the primary criterion for approval.”
Is Criterion Another Word For Criteria?
No. Criterion is singular and criteria is plural.
What Are The Criteria?
Criteria are the standards or requirements used to judge or evaluate something.
Is It More Than One Criteria Or Criterion?
More than one requires the plural form, so use criteria.
How Do You Use Criterion In A Sentence?
“Cost was an important criterion in the decision.”
How Do You Use Criteria In A Sentence?
“The hiring criteria include experience and communication skills.”
