A phase is one part or portion in recurring or serial activities or occurrences logically connected within a greater process, often resulting in an output or a change. Phase or phases may also refer to:

In science and engineering

* Phase (matter), a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter
* Phase transition is the transformation of a thermodynamic system from one phase to another
* The initial condition of a cyclic phenomenon
**Phase (waves), initial angle of a sinusoid function at its origin
**Continuous Fourier transform, angle of a complex coefficient representing the phase of one sinusoidal component
* The current (time varying) state of a cyclic phenomenon
**Lunar phase, the appearance of the Moon as viewed from the Earth
**Planetary phase, the appearance of the illuminated section of a planet
**Instantaneous phase, generalization for both cyclic and non-cyclic phenomena
* Phase factor, a complex scalar in the context of quantum mechanics
* Polyphase system, a means of distributing alternating current electric power in multiple conducting wires with definite phase offsets
**Single-phase electric power
**Three-phase electric power Basics of three-phase electric power
**Three-phase Mathematics of three-phase electric power
* In biology, a part of the cell cycle in which cells divide and reproduce
*Phaser (effect), an audio effect.
*Archaeological phase, a discrete period of occupation at an archaeological site.

In fiction

* "Phases" ("Buffy" episode), an episode of the TV series "Buffy the Vampire Slayer"
* Phases (.hack), fictional boss monsters from the .hack franchise
* Phase, an incarnation of the DC Comics character usually known as Phantom Girl
* Phase IV, a 1974 science fiction movie directed by Saul Bass


* A phase is a musical composition using Steve Reich's phasing technique.
* Phase (syntax), a syntactic domain hypothesized by Noam Chomsky
* Phase 10, a card game created by Fundex Games
* Phase (game), a music game for the iPod developed by Harmonix Music Systems
* Phase (combat) usually a period of combat within a larger military operation

ee also


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(as of the moon or a planet), ,

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  • phase — [ faz ] n. f. • 1661 astron.; h. 1544 fig.; répandu XIXe; gr. phasis « lever d une étoile » 1 ♦ Astron. Chacun des aspects que présentent la Lune et les planètes à un observateur terrestre, selon leur éclairement par le Soleil. ⇒ apparence. Les… …   Encyclopédie Universelle

  • Phase 10 — Karten aus Phase 10 (Fundex Ausgabe) Daten zum Spiel Autor Kenneth Johnson Verlag K K International (1985), Fundex Games (1986), Canada Games, F.X. Schmid (1995) …   Deutsch Wikipedia

  • Phase — (altgriechisch φασισ phasis „Erscheinung“) bedeutet: in der Wellenlehre der Schwingungszustand einer Welle an einer bestimmten Stelle und zu einem bestimmten Zeitpunkt, siehe Phase (Schwingung) in der Astronomie die Gestalt eines nicht… …   Deutsch Wikipedia

  • Phase — (f[=a]z), n.; pl. {Phases} (f[=a]z [e^]z). [NL. phasis, Gr. ?, fr. ? to make to appear: cf. F. phase. See {Phenomenon}, {Phantom}, and {Emphasis}.] 1. That which is exhibited to the eye; the appearance which anything manifests, especially any one …   The Collaborative International Dictionary of English

  • Phase 1 — may refer to:* Phase I Environmental Site Assessment * Phase 1 clinical trial * Phase 1 (bar)Phase One may also refer to:* Phase One The Danish camera equipment company …   Wikipedia

  • Phase 2 — Zeitschrift gegen die Realität ist ein vierteljährlich erscheinendes Theorie und Diskussionsorgan der radikalen Linken. Sie wird vom Verfassungsschutz des Landes Niedersachsen als Publikation der autonomen und sonstigen gewaltbereiten… …   Deutsch Wikipedia

  • phase — phase, aspect, side, facet, angle are comparable when they denote one of the possible ways in which an object of contemplation may be seen or may be presented. Phase may distinctly imply a change in the appearance of a thing without a change in… …   New Dictionary of Synonyms

  • phase — phase1 [fāz] n. [ModL phasis < Gr < phainesthai, to appear, akin to phainein: see FANTASY] 1. any of the recurrent stages of variation in the illumination and apparent shape of a moon or a planet 2. any of the stages or forms in any series… …   English World dictionary

  • Phase I — may refer to: *Phase I of a clinical trial in medicine *Phase I Environmental Site Assessment *Phase I reactions in metabolismSee also: Phase (disambiguation) …   Wikipedia

  • Phase II — may refer to: *Phase II clinical trial * *Phase II drug metabolism *Phase II, an alias used by the house outfit Blaze *PHASE 2, graffitti artist …   Wikipedia

  • Phase 5 — Ulli Meybohms HTML Editor phase 52 (Release: 21. Jan 2000) Basisdaten Entwickler: Hans Dieter Berretz (aktuell) Ulli Meybohm …   Deutsch Wikipedia

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