chronometry
Concise Oxford English Dictionary © 2008 Oxford University Press:
chronometry/krəˈnɒmɪtri/
▶noun the science of accurate time measurement.
– derivatives
chronometric adjective,
chronometrical adjective,
chronometrically adverb.
chronometric adjective,
chronometrical adjective,
chronometrically adverb.
'chronometry' also found in these Oxford entries:

