: 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.

Definition of phase noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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.

Mar 5, 2026 · A phase is a distinct stage or state within a larger cycle or system. The word shows up across science, medicine, and everyday life, and its specific meaning depends on context.

Phase definition: A distinct stage of development.

Apr 3, 2026 · Noun phase (plural phases) A distinguishable part of a sequence or cycle occurring over time.

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.