2. Adjective. (physics) (''of the interval between two events in spacetime'') lying outside each other's light cone, so that no information can pass from one to the other ¹
3. Adjective. (mathematics) (''of a four-vector'') having a space component of greater magnitude than its time component multiplied by the speed of light ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Spacelike
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