a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
"The engineer adjusted the phase of the signal to ensure it aligned perfectly with the reference point at zero degrees."
(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"
A distinguishable part of a sequence or cycle occurring over time.
"The project is currently in its final phase, where we will be preparing for launch."
In plain English: A phase is a temporary stage or period of time when something is happening or changing.
"The project has entered its final phase."
Usage: Use "phase" to describe a specific stage within a larger process, such as a construction phase or a phase of the moon. It refers to a distinct period that occurs in a defined order before moving to the next step.
adjust so as to be in a synchronized condition
"he phased the intake with the output of the machine"
To begin—if construed with "in"—or to discontinue—if construed with out—(doing) something over a period of time (i.e. in phases).
"The construction project will be completed in three distinct phases, starting next month and finishing by the end of the year."
In plain English: To phase something means to gradually get rid of it or stop using it over time.
"The old house is being phased out to make way for new apartments."
Usage: Use "phase" as a verb to describe starting or stopping an action gradually over a series of stages, often indicated by the prepositions "in" for beginning and "out" for ending. Avoid using it to mean simply entering or leaving a situation, which is better expressed with words like "enter" or "exit."
Passover
"My grandmother always makes matzo balls during the phase of Passover when we gather as a family."
The word "phase" comes from the New Latin phasis, which originated in Ancient Greek as a term for an appearance or manifestation. It entered English through scientific usage to describe distinct stages of development or change, evolving from its original sense of something becoming visible.