/ Dictionary / Index N nongrammatical: Meaning and Definition of Find definitions for: non•gram•mat•i•cal Pronunciation: (non"gru-mat'i-kul), [key] — adj. (of a sentence or expression) not conforming to the grammatical rules of a given language. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nongraded non grata Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language