Grammatical
Grammatical , adjective
[Latin grammaticus, grammaticalis; Greek {not transcribed} skilled in grammar, knowing one's letters, from {not transcribed} a letter: compare French 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.