/ Dictionary / Index A addition polymerization: Meaning and Definition of Find definitions for: addi'tion polymeriza"tion Pronunciation: [key] — Chem. Chem. See under(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. addition polymer addition reaction 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