synchronize

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To occur at the same time; be simultaneous.
2. v. To operate in unison.
3. v. To cause to occur or operate with exact coincidence in time or rate: We synchronized our watches.
4. v. To cause to occur or operate at the same time as something else: They synchronized their trip with the annual tulip festival.
5. v. To arrange (historical events) in a synchronism so as to indicate parallel occurrence.
6. v. To cause (soundtrack and action) to match exactly in a film.

Century Dictionary and Cyclopedia

1. To occur at the same time; agree in time.
2. To cause to be synchronous; make to agree in time of occurrence.
3. To cause to indicate the same time, as one timepiece with another; regulate or control, as a clock, by a standard timepiece, such as the chief clock in an observatory.
4. Also spelled synchronise.

Wiktionary

1. v. transitive To cause two or more events to happen at exactly the same time, at the same rate, or in a time-coordinated way. To harmonize in regard to time.
2. v. intransitive To occur at the same time or with coordinated timing.

GNU Webster's 1913

1. v. To agree in time; to be simultaneous.
2. v. To assign to the same date or period of time.
3. v. To cause to agree in time

WordNet 3.0

1. v. make synchronous and adjust in time or manner
2. v. operate simultaneously
3. v. happen at the same time
4. v. make (motion picture sound) exactly simultaneous with the action
5. v. arrange or represent events so that they co-occur
6. v. cause to indicate the same time or rate