Gram-măt'ic or Gram-măt'ic-al, a.
a. [Lat. grammaticus and grammaticalis, from grammatica, Gr. γραμματικὴ (sc. τέχνη), grammar, Fr. & Pg. grammatical, Pr. & Sp. gramatical, It. grammaticale. See supra.]
Sense 1. Belonging to grammar; as, a grammatical rule.
Sense 2. According to the rules of grammar; as, the sentence is not grammatical; the construction is not grammatical.