: in a way pertaining to grammar: with regard to grammar or in accordance with grammatical rules
speaking grammatically
a grammatically complex sentence
Two Welsh men who were busted for possession of marijuana were spared jail time by a judge who commended their grammatically correct text messages. Rachel DeSantis
Just as we teach children how to ride bikes by putting them on a bicycle, we need to teach students how to write grammatically by letting them write. Michelle Navarre Cleary