/ Dictionary / Index D decommission: Meaning and Definition of Find definitions for: de•com•mis•sion Pronunciation: (dē"ku-mish'un), [key] — v.t. to remove or retire (a ship, airplane, etc.) from active service. to deactivate; shut down: to decommission a nuclear power plant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decommission (Thesaurus) decolorize decompensation Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language