1. a very accurate timepiece, especially one used for navigation
Usage: often nautical or scientific contexts

Examples

• The ship’s chronometer was essential for determining longitude at sea.
• Scientists used a precision chronometer to measure the exact timing of the experiment.
• The antique chronometer in the museum still keeps perfect time.
• Marine chronometers were crucial tools for 18th-century explorers.
• The laboratory’s chronometer can measure time intervals to the microsecond.
• Captain Cook relied on his chronometer during his Pacific voyages.