Criteria Singular or Plural: Understanding Grammatical Number

Criterion and Criteria — See the Pattern

Look at these four sentences. Watch the word in blue. Does it talk about one thing or more than one?

• The most important criterion is price. (one)
• One criterion for the job is good English. (one)
• The criteria for the prize are talent, hard work, and luck. (three)
• All five criteria must be met. (five)

Did you see the pattern? When there is one rule, we use criterion. When there are two or more rules, we use criteria. Same word, just a different ending.

When to Use Criterion and When to Use Criteria

The word “criterion” comes from Greek. It is a special word that does not follow the normal rule for plurals. Most English words add -s to become plural — like book → books. But “criterion” changes its ending instead.

1. Use “criterion” when there is only ONE rule.

• The first criterion is honesty.
• What is the main criterion for picking a winner?
• Each criterion must be clear.

Notice the verb. With criterion (one), we use is: “The criterion is clear.”

2. Use “criteria” when there are TWO or more rules.

• The criteria are age, height, and weight.
• What criteria do you use to choose a hotel?
• All the criteria have been met.

Notice the verb again. With criteria (more than one), we use are: “The criteria are clear.”

Easy way to remember: Look at the last letter. Criteri-on ends in “on” = one. Criteri-a ends in “a” = many (think of data, media, phenomena — all end in -a, all plural).

Real-Life Examples With Criterion and Criteria

Here are sentences you might hear in school, at work, or in the news:

• “The most important criterion for this job is good communication.” (only one main rule)
• “Our criteria for a good hotel are clean rooms, kind staff, and a quiet area.” (three rules)
• “To win the prize, you must meet five criteria.” (five rules)
• “Each criterion on the list is worth ten points.” (one rule at a time)
• “What criteria do they use to pick the best player?” (asking about the rules)

You are doing great. Now let’s look at the mistake many learners make.

The Most Common Mistake With Criteria

Even native speakers and advanced learners get this wrong all the time — so if you mix them up, you are not alone. The biggest mistake is using “criteria” when you really mean one rule, with the verb is.

How to remember: Before you say “criteria”, count the rules in your head. One? Use criterion + is. More than one? Use criteria + are.

Other words like this — singular ends in something special, plural ends in -a:

• one datum → many data
• one phenomenon → many phenomena
• one medium → many media
• one bacterium → many bacteria

Test Yourself: Criterion or Criteria?

Choose the correct answer for each sentence. Click Check to see if you are right.

Keep Going — You Are Building Something

You just learned the difference between criterion and criteria. That is one more tricky pair you will never get wrong again.

But here is something interesting. You saw above that bacterium becomes bacteria, just like criterion → criteria. So when someone says “the bacteria is dangerous,” are they talking about one tiny living thing or millions? Most people get this wrong every day — even doctors and news reporters. Do you know which verb to use?

Next lesson: Is Bacteria Plural or Singular? The Answer Will Surprise You

Sources

1. Origin of criteria.
2. Definition of criterion.