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- Dictionarychronometer/krəˈnɒmɪtə/
noun
- 1. an instrument for measuring time accurately in spite of motion or variations in temperature, humidity, and air pressure.
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noun
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A chronometer ( khronómetron, "time measurer") is an extraordinarily accurate mechanical timepiece, with an original focus on the needs of maritime navigation. In Switzerland, timepieces certified by the Contrôle Officiel Suisse des Chronomètres (COSC) may be marked as Certified Chronometer or Officially Certified Chronometer. Wikipedia