In physics as well as in other sciences, Time is considered one of the few fundamental quantities. Time is used to define other quantities – such as velocity – so defining  Expand    Wikipedia

In physics as well as in other sciences, Time is considered one of the few fundamental quantities. Time is used to define other quantities – such as velocity – so defining Time in terms of such quantities would result in circularity of definition. An operational definition of Time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life. The operational definition leaves aside the question whether there is something called Time, apart from the counting activity just mentioned, that flows and that can be measured. Investigations of a single continuum called spaceTime brings the nature of Time into association with related questions into the nature of space, questions that have their roots in the works of early students of natural philosophy.

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