Periodicity is the quality of occurring at regular intervals (e.g. of time) and can occur in different contexts:

• A clock marks time at periodic intervals.
• A metronome ticks at periodic intervals.
• A publication published at periodic intervals can be called a "periodical", though it can also be called magazine.
• In mathematics, a function which recurs periodically is called periodic function.
• In chemistry, a table which classifies elements by means of periodicity is the periodic table.
• 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 music theory, periodicity is described as "predictability gives rise to expectations".

The measure of periodicity is frequency.

Periodic Table

When used in the periodic table, periodicity is the way in which properties of elements are repeated, depending on their location in the periodic table.

See also

• Cycle
• Simultaneity
• Synchronicity

Time

Periodizität | Periodiek (tijd)