Phase or phases may refer to:
Science
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State of matter, or phase, one of the distinct forms in which matter can exist
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Phase (matter), a region of space throughout which all physical properties are essentially uniform
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Phase space, a mathematical space in which each possible state of a physical system is represented by a point also referred to as a "microscopic state"
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Phase space formulation, a formulation of quantum mechanics in phase space
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Phase (waves), the position of a point in time (an instant) on a waveform cycle
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Instantaneous phase, generalization for both cyclic and non-cyclic phenomena
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AC phase, the phase offset between alternating current electric power in multiple conducting wires
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Single-phase electric power, distribution of AC electric power in a system where the voltages of the supply vary in unison
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Three-phase electric power, a common method of AC electric power generation, transmission, and distribution
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Phase problem, the loss of information (the phase) from a physical measurement
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Phase factor, a complex scalar used in quantum mechanics
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In continuous Fourier transform, the angle of a complex coefficient representing the phase of one sinusoidal component
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The argument or angle of Complex number is sometimes called the phase
Other sciences
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Archaeological phase, a discrete period of occupation at an archaeological site
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Color phase, in biology, a group of individuals within a species with a particular coloration
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Gametic phase, in genetics, the relationship between alleles at two chromosomal loci
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Lunar phase, the appearance of the Moon as viewed from the Earth
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Planetary phase, the appearance of the illuminated section of a planet
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Phase separation, in physical chemistry, the separation of a liquid mixture into two immiscible liquids above and below a meniscus
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Phase (syntax), in linguistics, a cyclic domain (proposed by Noam Chomsky)
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In biology, a part of the cell cycle in which cells divide (mitosis) or reproduce (meiosis)
Music
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Phase music, a compositional process often associated with minimalism
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Phase (band), a Greek alternative rock band
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Phases (band), an indie pop American band, formerly known as JJAMZ
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Phase (Jack Garratt album), 2016
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Phases (The Who album), a 1981 box set of albums by The Who
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Phases (I See Stars album), 2015
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Phase (Mildlife album), 2017
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Phases (Angel Olsen album), 2017
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"Phases", a song by English alternative rock band Keane from their 2019 album Cause and Effect
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Piano Phase, Reed Phase, Violin Phase and Phase Patterns are musical compositions by Steve Reich
Other entertainment
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"Phases" ( Buffy the Vampire Slayer), a 1998 episode of the TV series Buffy the Vampire Slayer
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Phases (.hack), fictional monsters in the .hack franchise
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Phase, an incarnation of the DC Comics character Phantom Girl
Other uses
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Phase 10, a card game created by Fundex Games
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Phase (video game), a 2007 music game for the iPod developed by Harmonix Music Systems
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Phase (combat), usually a period of combat within a larger military operation
See also
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Phase 1 (disambiguation)
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Phase 2 (disambiguation)
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Phase 3 (disambiguation)
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Phase 4 (disambiguation)
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Phase 5 (disambiguation)
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Phase space (disambiguation)
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Phaser (disambiguation)
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Phasing (disambiguation)
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Phasor (disambiguation)
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Phaze, a fictional world in Piers Anthony's Apprentice Adept series
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Faze (disambiguation)
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FASOR (disambiguation)
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Stage (disambiguation)