Time
Time has long been a major subject of philosophy, art, poetry, and science. Though dictionaries present some (varied) definitions of time (some of which are presented below), it is difficult to provide an uncontroversial definition because there are widely divergent views about its meaning, and concerns about whether there are any simpler terms with which to define it. Scholars also disagree on whether time itself can be measured or is itself part of the measuring system. To avoid these definitional problems, many fields use an operational definition in which only the units of measurement are defined.
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