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(noun) form
(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
(noun) phase angle
a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
(noun) stage
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