Adjective
(mathematics, physics) Of a four-vector in representing a point in spacetime, having a positive or negative four-vector norm for the metric signature (+, -, -, -) and (-, +, +, +) respectively.
(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.
Source: en.wiktionary.orgThe river of time flowed unmarked, towards the endless seas of timelike infinity. Stephen Baxter
'Closed timelike curve' is the jargon for time travel. It means you go out, come back and meet yourself in the past. Kip Thorne
According to this hypothesis, physics in or near closed timelike curves (time machines) can only be consistent with the universal laws of physics, and thus only self-consistent events can occur. Source: Internet
In special relativity, this notion is extended by adding the appropriate timelike quantity to a spacelike vector quantity, and we have 4d vectors, or " four vectors ", in Minkowski spacetime. Source: Internet
Mallett has some physical arguments that suggest that closed timelike curves would become possible through the center of a laser that has been twisted into a loop. Source: Internet
Spacetime can be explored by following up on timelike and lightlike geodesics—all possible ways that light and particles in free fall can travel. Source: Internet