Is it criterions or criteria?

Criterions is a rarely used plural form of the noun “criterion.” The standard plural form is criteria.

Criterions (rare plural) in a sentence example
We evaluated the proposals according to a wide range of criterions including practicality and costs.

On a related note, if you’re not sure whether to use criteria or criterion: “criterion” is the singular form, and “criteria” is the plural form.

Have you tried Quillbot’s free Grammar Checker? It will help you choose the correct plural form of nouns with irregular plurals such as “criterion.”