Relating to or concerned with grammar; grammatical in nature.
From Latin 'grammaticus' meaning 'of or pertaining to grammar or literature,' derived from Greek 'grammatikos,' which comes from 'gramma' (letter, written thing).
Though 'grammatic' is older than 'grammatical,' we mostly use 'grammatical' now—it's a great example of how even grammar words themselves follow patterns of language evolution and change!
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