/ Dictionary / Index I internal-combustion engine: Meaning and Definition of Find definitions for: inter'nal-combus'tion en"gine Pronunciation: [key] an engine of one or more working cylinders in which the process of combustion takes place within the cylinders. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. internal-combustion internal conversion Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language