worldline

Physics.

(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. 2018

Examples from the Web for world-line

Historical Examples of world-line

The time dimension and the world-line, he said sharply, excited in spite of himself.
Astounding Stories of Super-Science January 1931
Various
Revolving in the time dimension means telescoping in the world-line.
Astounding Stories of Super-Science January 1931
Various

British Dictionary definitions for world-line

world-line

noun

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