# Frequency definitions

frē'kwən-sē
The number of times any action or occurrence is repeated in a given period.
noun
The fact of occurring often or repeatedly; frequent occurrence.
noun
The number of periodic oscillations, vibrations, or waves per unit of time: usually expressed in hertz.
noun
The property or condition of occurring at frequent intervals.
noun
The number of times a specified periodic phenomenon occurs within a specified interval, as:
• The number of repetitions of a complete sequence of values of a periodic function per unit variation of an independent variable.
• The number of complete cycles of a periodic process occurring per unit time.
• The number of repetitions per unit time of a complete waveform, as of an electric current.
noun
The rate at which a repeating event occurs, such as the full cycle of a wave. Frequencies are usually measured in hertz.
The ratio of the number of occurrences of some event to the number of opportunities for its occurrence.
The definition of frequency is how often something happens.

An example of frequency is a person blinking their eyes 47 times in one minute.

noun
The Institute of Electrical and Electronics Engineers (IEEE) defines frequency as the number of complete cycles of sinusoidal variation per unit time, with the unit of time generally being that of one second. Plotting y = sin x, where x is expressed in radians, yields a sine wave as illustrated in Figure F-8. (From the Latin radius, a radian is a unit of plane angular measurement equivalent to the angle between two radii that enclose a section of a circle's circumference [arc] equal in length to the length of a radius.There are 2 radians in a circle.) A complete sine wave entails a cycle as measured from a point of zero (0) amplitude to a point of maximum positive amplitude (+A), through zero to a point of maximum negative amplitude (
(uncountable) The rate of occurrence of anything; the relationship between incidence and time period.
noun
(uncountable) The property of occurring often rather than infrequently.
noun
The number of oscillations (vibrations) in one second. Frequency is measured in Hertz (Hz), which is the same as "oscillations per second" or "cycles per second." For example, the alternating current in a wall outlet in the U.S. and Canada is 60Hz. Electromagnetic radiation is measured in kiloHertz (kHz), megahertz (MHz) and gigahertz (GHz). See wavelength, frequency response, audio, carrier and space/time.
(countable) The quotient of the number of times a periodic phenomenon occurs over the time in which it occurs.
noun
(statistics) Number of times an event occurred in an experiment (absolute frequency)
noun

### Origin of frequency

Latin frequentia multitude from frequēns frequent- crowded, numerous, frequent