grammatical Meaning, Definition & Usage

  1. adjective of or pertaining to grammar
    grammatic.
    • the grammatic structure of a sentence
    • grammatical rules
    • grammatical gender
  2. adjective conforming to the rules of grammar or usage accepted by native speakers
    well-formed.
    • spoke in grammatical sentences

WordNet

Gram*mat"ic*al adjective
Etymology
L. grammaticus, grammaticalis; Gr. skilled in grammar, knowing one's letters, from a letter: cf. F. grammatical. See Grammar.
Definitions
  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.

Webster 1913