/ Dictionary / Index E ext.: Meaning and Definition of Find definitions for: ext. Pronunciation: [key] extension. exterior. external. extinct. extra. extract. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exstrophy extant Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language