[ 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.

Nearby words

  1. chronological age,
  2. chronological order,
  3. chronologist,
  4. chronologize,
  5. chronology,
  6. chronometric,
  7. chronometry,
  8. chronon,
  9. chronooncology,
  10. chronopher

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 chronometer

British Dictionary definitions for chronometer


/ (krəˈnɒmɪtə) /


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 chronometer



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

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for chronometer


[ krə-nŏmĭ-tər ]

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.