/ Dictionary / Index D decathlon: Meaning and Definition of Find definitions for: de•cath•lon Pronunciation: (di-kath'lon), [key] — n. an athletic contest comprising ten different track-and-field events and won by the contestant amassing the highest total score. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decathlon (Thesaurus) decathlete decating Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language