A is one point or portion in a recurring series of changes. '''Phase''' or '''phases''' may also refer to:
In :
- 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.
In :
:
- Phase (syntax) , a syntactic domain hypothesized by Noam Chomsky
- Phase 10 , a card game created by Fundex Games
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