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