[n] (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"
[n] a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
[n] 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"
[n] (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"
[v] adjust so as to be in a synchronized condition; "he phased the intake with the output of the machine"
[v] arrange in phases or stages; "phase a withdrawal"