noun.
The regulation of occurrence, pace, or coordination to achieve a desired effect, as in music, the theater, or athletics.
noun.
The synchronization of the sparking of the plugs with the movement of the pistons in an internal-combustion engine.
The Century Dictionary and Cyclopedia
noun.
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.