"grammatical" in the adjective sense
1. grammatical, grammatic
of or pertaining to grammar
"the grammatic structure of a sentence"
"grammatical rules"
"grammatical gender"
2. grammatical, well-formed
conforming to the rules of grammar or usage accepted by native speakers
"spoke in grammatical sentences"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License