/ Dictionary / Index I invaluable: Meaning and Definition of Find definitions for: in•val•u•a•ble Pronunciation: (in-val'y-u-bul), [key] — adj. beyond calculable or appraisable value; of inestimable worth; priceless: an invaluable art collection; her invaluable assistance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: invaluable (Thesaurus) invalidity Invar Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language