/ Dictionary / Index I immensity: Meaning and Definition of Find definitions for: im•men•si•ty Pronunciation: (i-men'si-tē), [key] — n. vastness; enormous extent: the immensity of the Roman empire. the state or condition of being immense. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: immensity (Thesaurus) immense immensurable 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