Periodicity
# Periodicity

Periodicity or periodic may refer to:

## Mathematics

* Bott periodicity theorem, addresses Bott periodicity: a modulo-8 recurrence relation in the homotopy groups of classical groups
* Periodic function, a function whose output contains values that repeat periodically
* Periodic mapping

## Physical sciences

* Periodic table of chemical elements
* Periodic trends, relative characteristics of chemical elements observed
* Redshift periodicity, astronomical term for redshift quantization

## Other uses

* Fokker periodicity blocks, which mathematically relate musical intervals
* Periodic acid, a compound of iodine
* Principle of periodicity, a concept in generally accepted accounting principles
* Quasiperiodicity, property of a system that displays irregular periodicity
