Definition of "worldlines" [worldlines]

• Plural form of worldline. (noun)

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• "I am talking about Minkowski distances associated with two photon worldlines."
• "In quantum mechanics worldlines are somewhat blurred because of Heisenberg's uncertainty relation, Δx Δp h/2π."
• "Per Feynman, a particle travels from point A to point B along all possible worldlines."