Phase (band) definition

noun

(1) (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"

(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

"The reaction occurs in the liquid phase of the system"

(3) A particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle

(4) 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

(5) Adjust so as to be in a synchronized condition

"He phased the intake with the output of the machine"

(6) Arrange in phases or stages

"Phase a withdrawal"