/ Dictionary / Index D duplication: Meaning and Definition of Find definitions for: du•pli•ca•tion Pronunciation: (d"pli-kā'shun, dy"-), [key] — n. an act or instance of duplicating. the state of being duplicated. a duplicate. a type of chromosomal aberration in which a region of the chromosome is repeated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: duplication (Thesaurus) duplicating machine duplication of the cube Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language