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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
First recorded in 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. 2018.
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Examples from the Web for chronometrical
Historical Examples
  • At the age of 25 he employed his whole time in chronometrical improvements.

    Curious Epitaphs William Andrews
  • Brazil, in order to complete the chronometrical measurement of the world.

  • But beyond that, in the summer of 1833 he was employed by the Russian Government on a chronometrical expedition in the Baltic.

    Historic Oddities Sabine Baring-Gould
  • To turn the left cheek if the right be smitten, is chronometrical; hence, no average son of man ever did such a thing.

    Pierre; or The Ambiguities Herman Melville
  • To give all that thou hast to the poor, this too is chronometrical; hence no average son of man ever did such a thing.

    Pierre; or The Ambiguities Herman Melville
British Dictionary definitions for chronometrical


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 chronometrical



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

Online Etymology Dictionary, © 2010 Douglas Harper
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chronometrical 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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