/ Dictionary / Index S SETI: Meaning and Definition of Find definitions for: SETI Pronunciation: [key] search for extraterrestrial intelligence. seti- Pronunciation: [key] a combining form meaning “bristle”; used in the formation of compound words: setiform. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seth setiform Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language