/ Dictionary / Index S simultaneous: Meaning and Definition of Find definitions for: si•mul•ta•ne•ous Pronunciation: (sī"mul-tā'nē-us, sim"ul-), [key] — adj. existing, occurring, or operating at the same time; concurrent: simultaneous movements; simultaneous translation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: simultaneous (Thesaurus) simulcast simultaneous equations Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language