/ Dictionary / Index O operational: Meaning and Definition of Find definitions for: op•er•a•tion•al Pronunciation: (op"u-rā'shu-nl), [key] — adj. able to function or be used; functional: How soon will the new factory be operational? All units of the command are operational. of, pertaining to, or involved in military operations. on active service or combat duty:All units of the command are operational. of or pertaining to operations or an operation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: operational (Thesaurus) operation operational amplifier Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language