an imperfection, defect, or flaw in an object or machine that prevents it from functioning properly or effectively

the quality of being inadequate or falling short of perfection

(sports) a serve that is illegal (e.g., that lands outside the prescribed area)

the responsibility for a mistake or misfortune

(electronics) equipment failure attributable to some defect in a circuit (loose connection or insulation failure or short circuit etc.)

(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other