Grammatical

Gram‐mat″ic‐al (?), a. [L. grammaticus, grammaticalis; Gr. � skilled in grammar, knowing one's letters, from � a letter: cf. F. grammatical. See Grammar.] 1. Of or pertaining to grammar; of the nature of grammar; as, a grammatical rule.

2. According to the rules of grammar; grammatically correct; as, the sentence is not grammatical; the construction is not grammatical.

—Gram‐mat″ic‐al‐ly, adv. — Gram‐mat″ic‐al‐ness, n.