Spacetime is the four-dimensional “fabric” that combines three dimensions of space with one dimension of time into a single idea. In physics, objects and events are located in spacetime, not just in space or time alone.
Formed in English from *space* + *time*, popularized in the early 20th century with Einstein’s theory of relativity. It reflects the insight that space and time are linked, not separate.
Spacetime means that when you move fast in space, time itself behaves differently for you—distance and duration are two sides of the same coin. The word marks a moment when physics stopped treating time as a simple, universal clock.
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