The regulation of occurrence, pace, or coordination to achieve a desired effect, as in music, the theater, or athletics, In the design and construction of machinery, the proper adjustment of the parts of any machine so that its operations will follow in a given order to produce a given result, as in the movement of the needle, shuttle, and feed of a sewing-machine in consecutive order, uncountable The synchronization of the firing of the spark plugs in an internal combustion engine, verb_ Present participle of time