Criteria and Criterion: Can 'Criteria' Be Singular?
https://www.merriam-webster.com/words-at-play/criteria-vs-criterion-singular-plural-grammar
Criteria is typically a plural noun referring to standards on which a judgment can be made. Its singular is criterion, but evidence shows that criteria is frequently being used as a singular as well as a plural, much like data and agenda and their lesser-used singulars datum and agendum. As English borrows words from Latin and Greek, we sometimes must adjust our grammar to accommodate how those words were used in their original languages.
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