Definition of "frequency"

(uncountable or countable) The rate of occurrence of anything; the relationship between incidence and time period.  examples

(uncountable) The property of occurring often rather than infrequently.  examples

(countable) The quotient of the number of times n a periodic phenomenon occurs over the time t in which it occurs: f = n / t .  examples

A tone, character, mood, or vibe  quotations  examples

(statistics) number of times an event occurred in an experiment (absolute frequency)  examples