(in relativity) the path of a particle in space-time.
Origin of worldline
First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for world-line
The time dimension and the world-line, he said sharply, excited in spite of himself.
Revolving in the time dimension means telescoping in the world-line.
British Dictionary definitions for world-line
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