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 formschron·o·met·ric [kron-uh-me-trik] /ˌkrɒn əˈmɛ trɪk/, chron·o·met·ri·cal, adjectivechron·o·met·ri·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for chronometrical

Historical Examples of chronometrical

  • 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.

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

British Dictionary definitions for chronometrical



a timepiece designed to be accurate in all conditions of temperature, pressure, etc, used esp at sea
Derived Formschronometric (ˌkrɒnəˈmɛtrɪk) or chronometrical, adjectivechronometrically, 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

Word Origin and History for chronometrical



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

Online Etymology Dictionary, © 2010 Douglas Harper

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.