Criterion means a standard, test or rule on which a decision or judgement can be based.
Criterion is a noun.
Synonyms: measure, rule, standard, guidepost, gauge.
Note: Criterion has two plural forms, criteria and criterions.
The memo contains the criteria for the selection of a new secretary for our community.
What is the major criterion for judging the class leader?
We have several criteria for choosing a team captain, but the most important criterion is fitness.