/ Dictionary / Index E ethylenation: Meaning and Definition of Find definitions for: eth•yl•e•na•tion Pronunciation: (eth"u-lu-nā'shun), [key] — n. Chem. the process of introducing an ethylene group into a compound. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ethyl enanthate ethylene Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language