Period - Period

Period may refer to:

Common meanings

• Era, a length or span of time
• Full stop (or period), a punctuation mark
• Menstruation, also called a "period"

Science and mathematics

• Unit of time
• Period (physics), the duration of time of one cycle in a repeating event
• Orbital period, the time needed for one object to complete an orbit around another
• Period (periodic table), a horizontal row of the periodic table
• Period (gene), a gene in Drosophila involved in regulating circadian rhythm
• Period (geology), a subdivision of geologic time
• Periods (ring), members of the ring of numbers that can be expressed as integrals of algebraic differential forms over algebraically defined domains

Arts

• Period (music), a concept in musical composition
• Period, the final book in Dennis Cooper's George Miles cycle of novels

Other uses

• Period (school), a class meeting time in schools
• Periods in ice hockey; see Ice hockey#Periods and overtime