/ Dictionary / Index C compression ignition: Meaning and Definition of Find definitions for: compres'sion igni"tion Pronunciation: [key] ignition of engine fuel by the heat of air compressed in the cylinders into which the fuel is introduced. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. compression compression molding Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language