1735, from chrono- "time" + -meter. Related: Chronometric.

timepiece designed to be accurate in extreme conditions of wind, water, and pressure.

An accurate timepiece.

n. A portable timekeeper of the highest attainable precision.

an extremely accurate time-keeping device that is relatively unaffected by movement or temperature changes. It can be used for determining longitude at sea.

(n) an accurate clock (especially used in navigation)

A watch which has passed stringent tests at an official watch testing centre and carries a certificate.

A watch that is certified to satisfy official standards of precision by having been set under various position and temperature conditions

An instrument for measuring time very accurately. For a Swiss watch to be called a chronometer, it must meet very high standards set by the C.O.S.C. (Controle Officiel Suisse des Chronometres). The requirements are 15 days and nights at five different positions and temperature changes.

A watch that has been independently tested by the Official Swiss Chronometer Testing Institute (COSC) over the course several days in six different positions at three different temperatures, while rem [..]

an extremely accurate clock that is relatively unaffected by movement or temperature changes

A chronometer is a movement that has received a certificate delivered after passing a series of stringent tests under varied temperatures, vertical positions, etc. The most renowned official testing o [..]

A movement certified by an independent testing agency called C.O.S.C. (Contrôle Officiel Suisse des Chronomètres) and is known to be 99% accurate over a fifteen day period in a variety of simulated we [..]

A precision watch that is set in various temperatures and positions, thus meeting the accuracy standards set by an official watch institute in Switzerland. Most watch companies either provide this cer [..]

The ships timepiece. Once, it was a critical piece of kit, as accurate time was necessary to have accurate navigation.

A timekeeper accurate enough to be used to determine longitude by means of celestial navigation.

an especially accurate timepiece, set to Greenwich time; used for navigation.

An accurate clock that is used for navigation

A timekeeper accurate enough to be used to determine longitude by means of celestial navigation.

a ship's clock. Before GPS units were used, these needed to be extremely accurate on long voyages in order to determine a ship's longitude

This term refers to a precision watch that is tested in various temperatures and positions, thus meeting the accuracy standards set by C.O.S.C. in Switzerland. These watches are provided with a chrono [..]

A timepiece with a nearly constant rate. It is customarily used for comparison of watches and clocks to determine their errors. A chronometer is usually set approximately to Greenwich mean time and no [..]

A precise time piece used in navigation.