: 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, …

State of matter, or phase, one of the distinct forms in which matter can exist Phase (matter), a region of space throughout which all physical properties are essentially uniform

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

Nov 5, 2025 · (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 …

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.

a stage in a process of change or development: Each phase of life brings its own joys. a side, aspect, or point of view: This is only one phase of the question.

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 definition: A distinct stage of development.

Sep 25, 2025 · The other side of the Moon is dark. The position of the Moon and the Sun during Each of the Moon’s phases and the Moon as it appears from Earth during each phase. Credit: …