rate of occurrence or repetition of sth
fact of being frequent or happening often
rate at which a sound wave or radio wave vibrates; band or group of similar frequencies
"the frequency of modulation was 40 cycles per second"
"the frequency of his seizures increased as he grew older"
The diminished frequency of wars.
出自： Horace Smith
He wasn't calling her herzchen any more; of late she had noticed its frequency declining.
出自： C. McCullough