1. (a.) Of or pertaining to grammar; Of the nature Of grammar; as, a grammatical rule.

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

adjectival adverbial attributive conjunctive copulative correct descriptive formal functional glossematic glottochronological grammatic graphemic intransitive lexicographic lexicological lexicostatistical lingual linguistic linking metalinguistic morphological morphophonemic nominal participial philological phonemic phonetic phonological postpositional prepositional pronominal psycholinguistic semantic structural substantive syntactic tagmemic transitive verbal