chrono-, chron-

1. In computer science, a storage device that serves as a buffer to maintain synchronization between devices transmitting at different rates: Jack's iPad seemed to be extremely slow in communicating the data to his computer, so he was told that the synchronizers weren't working like they should.
2. A device that shows whether two recurrent motions take place at the same time: The pilot checked his synchronizer in order to sync the propellers of his plane which had two engines.

A device used in the method of sine-wave telegraphy (communication at a distance by the use of electric transmission over wire) of Crehare and Squier: A synchronograph is an automatic recording telegraph worked by an alternating electric current, with a synchronously moving strip of perforated paper.

Combined or comparative chronology; arrangement of events according to dates, those of the same date being placed or treated together; a comparative chronology: Mr. Smart wanted his students to create or construct a synchronology by grouping together all the occasions or occurrences in their towns according to the same date.

1. Referring to things that exist or happen at the same time; coincident in time; simultaneous: Jane's return to health was synchronous with the medicine she was taking.
2. Relating to different events or things belonging to the same time or period; involving or indicating a contemporaneous or simultaneous occurrence: Mary's visit with her friend was synchronous with her brother being at their aunt's house. That meant that both of them were not at home during the morning hours.
3. Regarding something recurring at the same successive instants of time; keeping time with; going on at the same rate and exactly together; having coincident periods, as two sets of vibrations: The couple watched the synchronous movements of the bird's wings when it was flying over the lake.
4. Of a satellite: concerning the rotation round the parent planet at the same rate as the planet rotates: The orbit of the spacecraft seemed to be synchronous with that of the Earth.

The simultaneous appearance of two separate events; synchronicity: The students seemed to be very happy with their teacher, and their teacher with them, so there was a good rapport of synchrony among them.

In nucleonics, a kind of accelerator or cyclotron whereby the electric field is kept at a constant frequency: A synchrotron is a machine that accelerates charged particles in circular orbits by varying the repetitions of the accelerating voltage and also magnetic field so as to maintain a circular orbit.

That curve upon which a particle moving under the action of gravity (or any given force) will reach the lowest (or some fixed) point in the same time, from whatever point it starts: A tautochrone or "isochrone" curve is the curve for which the time taken by a frictionless particle sliding down it under uniform gravity to its lowest point is independent of its starting point. The curve is a cycloid, and the time is equal to π times the square root of the radius over the acceleration of gravity.

The quality of having the properties of a tautochrone: Jill read about tautochronism as characterising a curve by which a moving object would arrive at a specific spot at the same time by the way of gravity from whichever spot it started.

Concerning the character of a tautochrone; occupying the same time; isochronous: In his math class at school, Peter learned about tautochronous oscillations of decreasing amplitude.

Referring to a geochronological technique: At the site of the volcano, Jim used tephrochronological methods to date the different layers of the volcanic ash.

The dating of volcanic eruptions and other events by studying layers of tephra: The geochronological method of tephrochronology utilizes individual layers of volcanic ash from one eruption to form a system whereby archaeological records can be categorized. .