/ Dictionary / Index I invariable: Meaning and Definition of Find definitions for: in•var•i•a•ble Pronunciation: (in-vâr'ē-u-bul), [key] — adj. not variable; not changing or capable of being changed; static or constant. —n. something that is invariable; a constant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: invariable (Thesaurus) Invar invariant Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language