Time is not inherently linear. It is not merely a fourth axis in a fixed spacetime model. Rather, it emerges as both a perceptual and physical construct tied to the rate of change within systems. When this rate of
change deviates significantly—especially in contexts involving mass and velocity—it can affect how time passes relative to an observer,
producing measurable physical effects. In some cases, this may even lead
to gravitational anomalies.
In _physics_ "time" must be measurable to have any meaning.
The instrument which measures "time" is a "clock" by definition.
So "time" is what we measure by clocks by definition.
There is no alternative to this definition.
You can measure all those quantities, but that is not a requirement.
Many things in nature are not measurable for one reason or the other,
but do still exist.
Physics deals also with distant stars, for instance, which are too far
away to measure them.
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