1. Any distinct time period in a sequence of events Noun
2. (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary Noun
3. A particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle Noun
4. (astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun) Noun
5. Arrange in phases or stages Verb
6. Adjust so as to be in a synchronized condition Verb