/ Dictionary / Index E expatiate: Meaning and Definition of Find definitions for: ex•pa•ti•ate Pronunciation: (ik-spā'shē-āt"), [key] — -at•ed, -at•ing. to enlarge in discourse or writing; be copious in description or discussion: to expatiate upon a theme. to move or wander about intellectually, imaginatively, etc., without restraint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: expatiate (Thesaurus) expat expatriate Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language