Periodicity

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Periodicity

Periodicity is the quality of occurring at regular intervals or periods (in time

Time

Time is a component of the measurement used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects....
or space

Space

Space is the boundless, three-dimensional extent in which Physical body and events occur and have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physics usually consider it, with time, to be part of the boundless four-dimensional continuum known as spacetime....
) and can occur in different contexts:

In timing devices:

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Encyclopedia

Periodicity is the quality of occurring at regular intervals or periods (in time

Time

Time is a component of the measurement used to sequence events, to compare the durations of events and the intervals between them, and to quantify the motions of objects....
or space

Space

A clock
Clock

A clock is an instrument used for indicating and maintaining the time and passage thereof. The word clock is derived ultimately from the Celtic languages words clagan and clocca meaning "bell"....
marks time at periodic intervals.
A metronome
Metronome

A metronome is any device that produces a regulated aural, visual or tactile pulse to establish a steady tempo in the performance of music. It is a useful practice tool for musicians that dates back to the early 19th century....
ticks at periodic intervals of time.

In science:

Periodicity in time is often specified by its frequency
Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency....
which has the metric units of Hertz
Hertz

The hertz is a measure of frequency per unit of time, or the number of list of cycles per second. It is the SI base unit of frequency in the International System of Units , and is used worldwide in both general-purpose and scientific contexts....
(the number of periods per second).
Oscillation
Oscillation

Oscillation is the repetitive variation, typically in time, of some measure about a central value or between two or more different states. Familiar examples include a swinging pendulum and Alternating current power....
s, wave
Wave

A wave is a disturbance that propagates through space and time, usually with transference of energy. While a mechanical wave exists in a medium , waves of electromagnetic radiation can travel through vacuum, that is, without a medium....
s and standing wave
Standing wave

A standing wave, also known as a stationary wave, is a wave that remains in a constant position. This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions....
s have crests at periodic intervals of space and/or time.
In physics, period is the number of cycles as a result of time (time/cycle). The amount of time it takes to complete one full revolution. Period is also the inverse of frequency.
In mathematics, a periodic function
Periodic function

In mathematics, a periodic function is a function that repeats its values in regular intervals or periods. The most important examples are the trigonometric functions, which repeat over intervals of length 2π....
is a function whose output contains values that repeat periodically.
In mathematics, in group theory, a periodic group
Periodic group

In group theory in mathematics, a periodic group or a torsion group is a group in which each element has finite set order . All finite groups are periodic....
is a group in which each element has finite order.
In chemistry, the periodic table
Periodic table

The periodic table of the chemical elements is a table method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869....
is a table which classifies the chemical elements by means of the periodicity of their chemical properties.

Other uses:

In finance
Finance

The field of finance refers to the concepts of time, money and risk and how they are interrelated. Banks are the main facilitators of funding through the provision of credit, although private equity, mutual funds, hedge funds, and other organizations have become important....
, the periodicity of a loan describes the interval between payments.
A publication published at periodic intervals can be called a "periodical", for example a magazine
Magazine

for quarterly in Heraldry see Quartering Magazines, periodicals, glossies or serials are publications, generally published on a regular schedule, containing a variety of Article , generally financed by advertising, by a purchase price, by pre-paid magazine subscription, or all three....
.
In music theory
Music theory

Music theory is the field of study that deals with how music works. It examines the language and notation of music. It identifies patterns that govern composer techniques....
, periodicity is described as "predictability gives rise to expectations".

Periodicity

See also