The definition of frequency is how often something happens.(noun)
An example of frequency is a person blinking their eyes 47 times in one minute.
See frequency in Webster's New World College Dictionary
noun pl. frequencies
Origin: ME < Fr < L frequentia < frequens: see frequent
See frequency in American Heritage Dictionary 4
noun pl. fre·quen·cies
Origin: Latin frequentia, multitude
Origin: , from frequēns, frequent-, crowded, numerous, frequent.
Learn more about frequency