Noun
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(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)
"the full phase of the moon"
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a particular point in the time of a cycle
measured from some arbitrary zero and expressed as an angle
- phase angle -
(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
"the reaction occurs in the liquid phase of the system"
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any distinct time period in a sequence of events
"we are in a transitional stage in which many former ideas must be revised or rejected"
Verb
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adjust so as to be in a synchronized condition
"he phased the intake with the output of the machine"
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arrange in phases or stages
"phase a withdrawal"