From Wikipedia, the free encyclopedia
|Look up period or periodic in Wiktionary, the free dictionary.|
Period (from Greek περίοδος) or periodic may refer to:
- Period, the time taken for one full oscillation; see on frequencies
- Orbital period, the time for one object to complete an orbit around another
- Period (periodic table), a horizontal row of the periodic table
- Period, euphemism for menstruation, the periodic discharge of blood and mucosal tissue (the endometrium) from the uterus and vagina
- 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
- Period (punctuation), a punctuation mark indicating the end of a sentence or phrase, specifically, a dot.
- Period piece, a creative work set in a particular era
- Period (music), a concept in musical composition
- Period, the final book in Dennis Cooper's George Miles cycle of novels
- Period (school), a class period in schools
- Periods in ice hockey; see Ice hockey § Periods and overtime
|This disambiguation page lists articles associated with the same title.
If an internal link led you here, you may wish to change the link to point directly to the intended article.