A noun in certain languages that has only two different grammatical cases instead of the usual three or more.
From Greek 'di-' (two) and 'ptote' (case/falling), combining to mean 'two cases.' Used in linguistics to describe nouns with limited case inflections.
Ancient Greek and Latin grammarians were obsessed with classifying nouns by how many cases they had—diptotes were the rule-breakers that kept them up at night, refusing to follow the full declension patterns of their classmates.
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