/ Dictionary / Index I internal-combustion: Meaning and Definition of Find definitions for: in•ter•nal-com•bus•tion Pronunciation: (in-tûr'nl-kum-bus'chun), [key] — adj. of or pertaining to an internal-combustion engine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: internal-combustion (Thesaurus) internal clock internal-combustion engine 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