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Definition of Timelike
1. Adjective. (mathematics physics) Of a four-vector in representing a point in spacetime, having a positive four-vector norm. ¹
2. Adjective. (physics) (''of the interval between two events in spacetime'') Having overlapping light cones, so that information can pass from one to the other, and one can be envisaged as a cause of the other. ¹
¹ Source: wiktionary.com