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[kruh-nom-i-ter] /krəˈnɒm ɪ tər/
a timepiece or timing device with a special mechanism for ensuring and adjusting its accuracy, for use in determining longitude at sea or for any purpose where very exact measurement of time is required.
any timepiece, especially a wristwatch, designed for the highest accuracy.
Origin of chronometer
1705-15; chrono- + -meter
Related forms
[kron-uh-me-trik] /ˌkrɒn əˈmɛ trɪk/ (Show IPA),
chronometrical, adjective
chronometrically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for chronometer
  • The crew saved nothing but what they stood in, and the vessel's papers and chronometer.
  • And an ytterbium clock has the potential to be even more accurate and stable than the cesium chronometer.
  • The regular chronometer movement, because of its delicacy, is out of the question for rough land or water travel.
  • The planetary week is not a grand chronometer of celestial movements or a gauge of seasonal changes.
  • The second method has been around since the invention of the marine chronometer to determine longitude.
  • The chronometer or timekeeper were used for longitude.
  • Another tool he used was a chronometer, which measures time, and he was skilled in reading charts.
  • The time spent in the application of the fertilizer to all the pots on the bench was measured with a chronometer.
  • The marine chronometer: its history and development.
British Dictionary definitions for chronometer


a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea
Derived Forms
chronometric (ˌkrɒnəˈmɛtrɪk), chronometrical, adjective
chronometrically, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for chronometer

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

Online Etymology Dictionary, © 2010 Douglas Harper
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chronometer in Science
An extremely accurate clock or other timepiece. Chronometers are used in scientific experiments, navigation, and astronomical observations. It was the invention of a chronometer capable of being used aboard ship, in 1762, that allowed navigators for the first time to accurately determine their longitude at sea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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