/ Dictionary / Index D DM: Meaning and Definition of Find definitions for: DM Pronunciation: [key] See dm Pronunciation: [key] decimeter; decimeters. DM. Pronunciation: [key] See Dm. Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dm (Thesaurus) dlvy. DMA Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language