: the point or stage in a period of uniform circular motion, harmonic motion, or the periodic changes of any magnitude varying according to a simple harmonic law to which the rotation, oscillation, or …

A phase is one of the forms in which matter can exist, such as solid, liquid, or a gas.

1. any distinct or characteristic period or stage in a sequence of events or chain of development: there were two phases to the resolution; his immaturity was a passing phase.

Look up Phase, phase, or phases in Wiktionary, the free dictionary.

Jan 20, 2026 · (astronomy) A particular appearance or state in a regularly recurring cycle of changes with respect to quantity of illumination or form, or the absence, of a body's illuminated disk. Illustrated …

Phase definition: A distinct stage of development.

phase /feɪz/ n., v., phased, phas•ing. n. [countable] a stage in a process of change or development: Her temper tantrums are just part of the phase she's going through. Astronomy the particular, usually …

PHASE definition: any of the major appearances or aspects in which a thing of varying modes or conditions manifests itself to the eye or mind. See examples of phase used in a sentence.

Phase generally refers to a distinct stage or period in a process of change or development. It can be used in various fields such as physics, where it signifies the position of a point in time or space on a …

Factsheet What does the noun phase mean? There are seven meanings listed in OED's entry for the noun phase. See ‘Meaning & use’ for definitions, usage, and quotation evidence.