/ Dictionary / Index C complex machine: Meaning and Definition of Find definitions for: com'plex machine' Pronunciation: [key] — Mech. Mech. machine (def. 4c). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. complexity complex number Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language