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English definition of “phase”

phase

noun [C]    /feɪz/
any stage in a series of events or in a process of development : The project is only in its first phase of planning , so we haven’t yet established the cost . The phases of the moon are the regular changes in its shape as it appears to people on earth . physics A phase is one of the forms in which matter can exist , such as solid , liquid , or a gas . physics A phase is also one of the stages or points in a repeating process measured from a specific starting point .
(Definition of phase noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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