A criterion is a single rule, standard, or condition used to judge or decide something. It is one item in a list of things something must meet or match.
From Greek *kritērion* “means of judging,” from *kritēs* “judge.” English kept the singular *criterion* and plural *criteria* directly from Greek grammar.
Knowing this word instantly upgrades your academic writing, because you can say “one criterion” instead of “one criteria.” It also reminds you that every decision you make is based on hidden criteria—even when you think you’re just going with your feelings.
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