(physics) The velocity of propagation of a pure sine wave of infinite extent and infinitesimal amplitude.

An electronic circuit which changes the phase of a signal by 180°; used in the input stage of a push-pull amplifier.

(physics) the rule which states that the number of degrees of freedom in a system at equilibrium equals the number of components minus the number of phases plus 2

(astronomy) Any one of the aspects or appearances presented by the moon as seen from Earth.

(electricity) Differing in phase by a quarter of a cycle; two-phase.

(physics) The conversion of a single-phase system into a multiphase system; especially the separation of a solution into two immiscible liquids.

The homogeneous part of a heterogeneous system that consists of water or a solution in water of a substance.

(physics) The transition between thermodynamic phases of a physical system, especially one between the solid, liquid, and gaseous phases of a substance.

(physics) One of the three fundamental structural phases of matter in which the cohesive force of matter is strong enough to keep the molecules or atoms in the given positions, restraining the thermal mobility.

(physics) One of the three fundamental structural phases of matter in which the thermal mobility of molecules or atoms is comparable with the cohesiveness, having them connected but fluid in a mass.