Spacelike refers to a separation between two events in spacetime where the distance between them is greater than what can be connected by light traveling in vacuum. This means that no signal or causal influence can travel between these events, indicating that they cannot affect each other. In the context of Minkowski spacetime, spacelike intervals are essential in understanding the geometry of how events relate to one another, particularly in relation to causality and the structure of spacetime itself.
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