synchronizer

Noun

 * 1) One who or that which synchronizes.
 * 2)  Part of a synchromesh manual transmission that allows the smooth engagement of gears.
 * 3)  A device that permits an automatic weapon to fire between the blades of a revolving propeller.
 * 4)  A kind of arbiter.
 * 5)  A device for aligning multiple film strips in a replay or editing device.
 * 6)  An algorithm that can be applied to a synchronous distributed algorithm to produce a version that operates in asynchronous networks.