fre·quen·cy (n)

1. frequency or frequence the fact of happening often or regularly at short intervals

2. the number of times that something happens during a particular period of time

3.  a wavelength on which a radio or television signal is broadcast and to which a receiving set can be tuned

4. the number of times that something such as an oscillation, a waveform, or a cycle is repeated within a particular length of time, usually one second. Symbol ν Symbol f

5. the number of times a particular result occurs in a statistical survey absolute frequency, or the ratio of that number to the total results obtained in the survey relative frequency