1. (noun)frequency, frequence, oftenness the number of occurrences within a giventimeperiod "the frequency of modulation was 40 cycles per second"; "the frequency of his seizures increased as he grew older"
2. (noun)frequency, relative frequency the ratio of the number of observations in a statistical category to the totalnumber of observations
3. (noun)frequency, absolute frequency the number of observations in a given statistical category