(transitive) Cause two or more events or actions to happen at the same time or rate, or to coordinate the timing of events.

(transitive) To set (a clock or watch) to display the same time as another.

(computing, transitive, intransitive) To cause (a set of files, data, or settings) on one computer or device to be (and try to remain) the same as on another.

(intransitive, of inanimate entities) To agree, be coordinated with, or complement well.

(transitive) To coordinate or combine.