Another form of chronometric, relating to the precise measurement of time or the instruments used for such measurement.
An alternative adjectival form of chronometric, using the longer -ical suffix ending instead of just -ic. Both forms coexist in English with the same meaning.
Chronometrical is just the fancy Victorian way of saying chronometric—it's the kind of word you'd find in 19th-century scientific papers written when longer words sounded more sophisticated!
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