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Before there was Latin _periodus_ there was Greek
_odos_ "way" (same root as "odometer")
giving no reason to restrict the concept to temporal periods.
If I ask students for the wavelength of a sound wave
I expect them to report a length,
and if I ask for the period of a sound wave I expect
them to report a time.
Not so clear.
To my ears, in this context wavelength is a
_more specific_ term than
period, equivalent to "spatial period". ///