Learner's definition of FREQUENCY
1 [noncount] : the fact or condition of happening often : common occurrence 2 [noncount] : the number of times that something happens during a particular period
The frequency of our visits decreased [=our visits occurred less often] during the school year.
Our visits decreased in frequency.
Errors were occurring with increasing frequency.
3 technical : the number times that something (such as a sound wave or radio wave) is repeated in a period of time (such as a second)
waves having very different frequencies from one another
a current having a frequency of 60 hertz
a radio frequency of 30 megahertz