Periodicity

Periodicity may refer to:

In science:

• Periodicity in time is often specified by its frequency which has the metric units of hertz (the number of periods per second)
• Oscillations, waves and standing waves 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 is a function whose output contains values that repeat periodically
• In mathematics, in group theory, a periodic group is a group in which each element has finite order
• In chemistry, the periodic table is a table which classifies the chemical elements by means of the periodicity of their chemical properties

See also

• Cycle (disambiguation)
• Frequency (disambiguation)
• Quasiperiodicity, property of a system that displays irregular periodicity
• Seasonality, periodic variation, or periodic fluctuations
• Simultaneity (disambiguation)
• Synchronicity
• Utility frequency