1. of, relating to, or measured by a chronometer or precise timekeeping
Usage: formal; technical
2. relating to the measurement of time with great accuracy
Usage: formal; technical

Examples

• The chronometrical precision of the atomic clock is essential for modern telecommunications.
• Sailors relied on chronometrical instruments to determine their longitude at sea.
• The experiment required chronometrical accuracy to measure the particle's decay rate.
• Chronometrical data from the observatory helped establish the standard time zones.
• The chronometrical measurements were recorded to the nearest millisecond.