/ Dictionary / Index C coinsurance: Meaning and Definition of Find definitions for: co•in•sur•ance Pronunciation: (kō"in-shoor'uns, -shûr'-), [key] — n. insurance underwritten jointly with another or others. a form of property insurance in which an insurer assumes liability only for that proportion of a loss which the amount of insurance bears to a specified percentage of the value of the property. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coinsurance (Thesaurus) coinstantaneous coinsure Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language