Period or periodic may refer to: [edit] Language and literature Full stop, a punctuation mark indicating the end of a sentence or phrase Periodic sentence, a sentence that is not grammatically complete until its end The final book in Dennis Cooper's George Miles cycle of novels Period piece describes creative works set in a particular era. [edit] Science and mathematics Menstruation, a phase of the menstrual cycle in which the uterine lining is shed Orbital period, a concept in astronomy. Period (gene), a gene in Drosophila involved in regulating circadian rhythm Period (geology), a subdivision of geologic time The period of a periodic function Periodic group in group theory Period (number), a concept in mathematics Period (periodic table), a horizontal row of the periodic table Periodic acid, an oxoacid of iodine Period (physics), the reciprocal of frequency Period of orbit [edit] Other meanings Period (music), a concept in musical composition Periodicity, the quality of occurring at regular intervals For historical period, see List of time periods [edit] See also Periodization

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