A clock marks time at periodic intervals.

A publication published at periodic intervals can be called a "periodical", for example a magazine.

In finance, the periodicity of a loan describes the interval between payments.

In music theory, periodicity is described as "predictability gives rise to expectations".

Synchronicity is the experience of two or more events which occur in a meaningful manner, but which are causally unrelated. In order to be synchronous, the events must be related to one another conceptually, and the chance that they would occur together...

A metronome ticks at periodic intervals of time.

Simultaneity is the property of two events happening at the same time in at least one reference frame. The noun Simult means a supernatural coincidence, two or more divinely inspired events that occur at or near the same period of time that are related...

Cycle or Cyclic may refer to: Motorcycle Bicycle Cycling, the act of riding a bicycle -cycle, a suffix in the English language In music: Cycle (music), a section of a piece that is repeated or repeatable Cyclic form, a technique of construction...

Periodicity is the quality of occurring at regular intervals or periods (in time or space) and can occur in different contexts:

In mathematics, a function whose output contains values that repeat periodically is called a periodic function.

In chemistry, the periodic table is a table which classifies the chemical elements by means of the periodicity of their chemical properties.

In physics, wave 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.

The measure of periodicity in time is frequency which has the metric units of Hertz.