frequency

US /ˈfriː.kwən.si/
UK /ˈfriː.kwən.si/
"frequency" picture
1.

the rate at which something occurs or is repeated over a particular period of time or in a given sample

:
The frequency of his visits increased over time.
What is the frequency of the bus service?
2.

the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone by a body in unit time

:
Radio stations broadcast on different frequencies.
The human ear can detect sounds within a certain range of frequencies.