Definition of "worldline" [worldline]

• Alternative spelling of world line. (noun)

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• "On the other hand, Dowe's answer is that the worldline of the moving shadow is the worldline of an object that does not possess charge, while the ˜worldline™ of the segments of shadowed plate segments is not the worldline of an object."
• "Does a physical object of light (photon) GAIN a 'worldline' when it collapses, that it didn't have as wave?"
• "And the question "Where was the 'worldline' before it became 'real' (space? time? spacetime?) and what does it include?" is no more meaningful then "Where was the sound before I clapped my hands?""