GRAMMATICAL
grammatical, well-formed
(adjective) conforming to the rules of grammar or usage accepted by native speakers; “spoke in grammatical sentences”
grammatical, grammatic
(adjective) of or pertaining to grammar; “the grammatic structure of a sentence”; “grammatical rules”; “grammatical gender”
Source: WordNet® 3.1
Etymology
Adjective
grammatical (comparative more grammatical, superlative most grammatical)
Not breaching any constraints of the grammar, or morpho-syntax, of the relevant language.
Of or pertaining to grammar.
Synonyms
• grammatic
Antonyms
• (acceptable): ungrammatical
Source: Wiktionary
Gram*mat"ic*al, a. Etym: [L. grammaticus, grammaticalis; Gr.
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. --
Gram*mat"ic*al*ly, adv.
– Gram*mat"ic*al*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition