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wave

2.26 wave. Disturbance such that the quantity serving as a measure of the disturbance varies with position and time in a manner that at pairs of neighboring positions the disturbance is similar except for a time difference. Annotation...

phase

2.23 phase. A reference angle for the argument of a sine (or cosine) function.

phase of a periodic quantity

2.22 phase of a periodic quantity. For a particular value of an independent variable, the fractional part of a period through which the independent variable has advanced, measured from an arbitrary reference....