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worldline

Physics.
1.
(in relativity) the path of a particle in space-time.
Origin of worldline
1915-1920
First recorded in 1915-20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for world-line

world-line

noun
1.
(physics) a line on a space–time path that shows the path of a body
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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