Grammatical

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.

Thesaurus Entries

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