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