/ Dictionary / Index A addition polymer: Meaning and Definition of Find definitions for: addi'tion pol"ymer Pronunciation: [key] — Chem. Chem. a polymer formed by the direct reaction of two or more monomers, and with no resulting water or other by-product. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. addition compound addition polymerization Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language