Common Mistakes with the Plural of Criterion

If you have ever written about a standard, a rule, or a test requirement, you have likely stopped to ask: is it criterions or criteria? The direct answer is that the correct plural of criterion is criteria. Using criterions is a common mistake that can make your writing sound unpolished, especially in formal or academic contexts. This guide will explain exactly when to use each form, how to avoid the most frequent errors, and how to sound natural in both emails and everyday conversation.

Quick Answer: Criterion vs. Criteria

Criterion is singular. It refers to one standard or principle by which something is judged. Criteria is the plural form. It refers to two or more standards or principles. Never use criterions. In informal conversation, some native speakers use criteria as a singular noun, but this is widely considered incorrect in formal writing, academic work, and professional emails.

Understanding the Singular and Plural Forms

The word criterion comes from Greek, and it follows the Greek plural pattern. Many English words from Greek keep their original plural endings, such as phenomenon (plural: phenomena) and thesis (plural: theses). Criterion is no exception. The singular ends in -on, and the plural changes to -a.

When to Use Criterion (Singular)

Use criterion when you are talking about exactly one standard, rule, or test. This is common in formal writing, academic papers, and professional settings.

Example: The main criterion for admission is your grade point average.

Example: One important criterion for a good job candidate is relevant experience.

When to Use Criteria (Plural)

Use criteria when you are talking about two or more standards. This is the correct plural form in all contexts, from casual conversation to formal reports.

Example: The criteria for the scholarship include financial need, academic performance, and community service.

Example: We have established several criteria to evaluate the proposals.

Comparison Table: Criterion vs. Criteria

Natural Examples in Different Contexts

Seeing the words used naturally in sentences helps you remember the correct form. Below are examples for formal writing, email, and everyday conversation.

Formal Writing and Academic Contexts

In academic papers, reports, and official documents, precision matters. Always use criterion for singular and criteria for plural.

• The primary criterion for the experiment was the reaction time of the participants.
• The criteria for evaluating the data were clearly defined before the study began.
• Each criterion was weighted equally in the final analysis.

Professional Emails

In business emails, using the correct plural form shows attention to detail. Avoid using criteria as a singular noun.

• Dear team, please review the criteria for the new project proposal before our meeting.
• The main criterion for selecting a vendor is cost-effectiveness.
• Could you clarify which criterion you are referring to in your email?

Everyday Conversation

In casual speech, many native speakers use criteria as a singular noun. While this is common, it is still considered a mistake in careful writing. In conversation, you can follow the natural flow, but be aware of the correct forms.

• What are the criteria for joining the club? (Correct plural)
• The main criterion is that you have to live nearby. (Correct singular)
• I think that criteria is too strict. (Informal, but common)

Common Mistakes with the Plural of Criterion

Even advanced English learners make these errors. Here are the most frequent mistakes and how to fix them.

Mistake 1: Using “Criterions”

This is the most common error. Criterions is not a standard English word. Always use criteria for the plural.

Incorrect: We have three main criterions for the job.

Correct: We have three main criteria for the job.

Mistake 2: Using “Criterias”

Adding an -s to criteria is another common error. Criteria is already plural, so it does not need an extra -s.

Incorrect: The criterias for the competition are listed online.

Correct: The criteria for the competition are listed online.

Mistake 3: Using “Criteria” as a Singular Noun in Formal Writing

In formal contexts, using criteria with a singular verb is incorrect. For example, saying the criteria is instead of the criteria are.

Incorrect: The main criteria for success is hard work.

Correct: The main criterion for success is hard work. (Singular)

Correct: The criteria for success are hard work and dedication. (Plural)

Better Alternatives and When to Use Them

If you are unsure about using criterion or criteria, you can sometimes rephrase the sentence to avoid confusion. Here are some alternatives.

When to Use “Standard” or “Requirement”

If you are writing for a general audience or in a less formal context, using simpler words can be clearer.

• Instead of: The criterion for approval is a valid ID.
• Use: The requirement for approval is a valid ID.

• Instead of: We need to meet all the criteria.
• Use: We need to meet all the standards.

When to Use “Factor” or “Measure”

In business or technical writing, these words can replace criterion without changing the meaning.

• Instead of: The main criterion is cost.
• Use: The main factor is cost.

• Instead of: We have several criteria for evaluation.
• Use: We have several measures for evaluation.

Mini Practice: Test Your Knowledge

Choose the correct word to complete each sentence. Answers are below.

1. The most important ______ for the job is a positive attitude. (criterion / criteria)
2. All the ______ for the grant have been met. (criterion / criteria)
3. We need to establish clear ______ before we begin. (criterion / criteria)
4. That ______ is no longer relevant to our decision. (criterion / criteria)

Answers

1. criterion (singular, one standard)
2. criteria (plural, all of them)
3. criteria (plural, more than one)
4. criterion (singular, one standard)

Frequently Asked Questions

1. Is it ever correct to use “criterions”?

No. Criterions is not accepted in standard English. The only correct plural form is criteria. Some dictionaries may list criterions as a rare variant, but it is best to avoid it entirely.

2. Can I use “criteria” as a singular noun in informal writing?

Yes, many native speakers do this in casual emails, text messages, and everyday speech. However, it is still considered a grammatical error in formal writing, academic papers, and professional reports. To be safe, use criterion for singular and criteria for plural in all careful writing.

3. What is the difference between “criterion” and “standard”?

Criterion is a specific principle or test used to make a judgment. Standard is a broader term that can mean a level of quality or a rule. In many contexts, they are interchangeable, but criterion is more precise when referring to a single test or requirement.

4. How do I remember the correct plural form?

Think of other Greek words that follow the same pattern. For example, phenomenon becomes phenomena, and criterion becomes criteria. If you remember that criterion ends in -on, the plural ends in -a.

For more help with confusing plural forms, visit our Confusing Plurals section. You can also explore Common Plural Forms for other regular and irregular patterns. If you have questions about specific words, check our FAQ page or contact us for further guidance.