noun pl. frequencies -·cies

1. Obsolete
   1. the condition of being crowded
   2. a crowd
2. the fact of occurring often or repeatedly; frequent occurrence
3. the number of times any action or occurrence is repeated in a given period
4. Math., Statistics
   1. the number of times an event, value, or characteristic occurs in a given period
   2. the ratio of the number of times a characteristic occurs to the number of trials in which it can potentially occur
5. Physics the number of periodic oscillations, vibrations, or waves per unit of time: usually expressed in hertz: abbrev. f

Etymology: ME < Fr < L frequentia < frequens: see frequent