/ Dictionary / Index A agate: Meaning and Definition of Find definitions for: ag•ate Pronunciation: (ag'it), [key] — n. a variegated chalcedony showing curved, colored bands or other markings. a playing marble made of this substance, or of glass in imitation of it. a 5-point type of a size between pearl and nonpareil. Cf. ruby (def. 5). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: agate (Thesaurus) agata agate line Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language