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grammatical (adj.)

1520s, "of or pertaining to grammar," from French grammatical and directly from Late Latin grammaticalis "of a scholar," from grammaticus "pertaining to grammar" (see grammar). Related: Grammatically (c. 1400).

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Definitions of grammatical from WordNet

grammatical (adj.)
of or pertaining to grammar;
grammatical rules
grammatical gender
Synonyms: grammatic
grammatical (adj.)
conforming to the rules of grammar or usage accepted by native speakers;
spoke in grammatical sentences
Synonyms: well-formed
From wordnet.princeton.edu