n. The quality or condition of being useful; usefulness: "I have always doubted the utility of these conferences on disarmament” ( Winston S. Churchill). n. A useful article or device.n. A public utility.n. A commodity or service, such as electricity, water, or public transportation, that is provided by a public utility.n. Computer Science A utility program.adj. Used, serving, or working in several capacities as needed, especially:adj. Prepared to play any of the smaller theatrical roles on short notice: a utility cast member. adj. Capable of playing as a substitute in any of several positions: a utility infielder. adj. Designed for various often heavy-duty practical uses: a utility knife; a utility vehicle. adj. Raised or kept for the production of a farm product rather than for show or as pets: utility livestock. adj. Of the lowest U.S. Government grade: utility beef.