/ Dictionary / Index D diesel cycle: Meaning and Definition of Find definitions for: die'sel cy"cle Pronunciation: [key] a theoretical heat cycle for an engine in which combustion occurs at a constant pressure and cooling at a constant volume. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diesel diesel-electric Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language