Phase

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A phase is one point or portion in a recurring series of changes. Phase or phases may also refer to:

Phase (matter), a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter
Phase (systems), in a complex system, a behaviour that emerges from the interactions of components at a small scale
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.

"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

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