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The "phenomena" and "criteria" criterion

Ulam Spiral

People often mis-pluralize the words "phenomenon" and "criterion." These are the singular forms, of course. People often misuse them, referring to "the phenomena," for example.

The reason that the distinction is important (and somewhat ironically so) is that both of these words are common in discussions that require specificity.

When the singular/plural is bungled in a scientific argument, credibility becomes suspect in a way that is distractive at best.