/ Dictionary / Index I instanter: Meaning and Definition of Find definitions for: in•stan•ter Pronunciation: (in-stan'tur), [key] — adv. immediately; at once. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: instanter (Thesaurus) instant camera instantiate Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language