from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Time regarded as a coordinate dimension and required by relativity theory, along with three spatial dimensions, to specify completely the location of any event.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The fourth coordinate indicating a position along the fourth axis.
- n. The dimension of time.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the fourth coordinate that is required (along with three spatial dimensions) to specify a physical event
Sorry, no etymologies found.
Mr. Barnabas had come striding from his house in the Crescent, had turned the corner, and was apparently marching on to the little tobacconist’s at the end of the street, where it was his custom to stop and pick up a copy of the Times and the Standard, when unfortunately he stepped into the fourth dimension or was the victim of spontaneous combustion or some sort of accident to an atom.
Unfortunately, Talker's race had no inkling of relativity, as their science was of the type which develops better guns and faster ships, without bothering too much with theory; and Kirk's only acquaintance with the concept had been made through the pages of a classic novel on time travel — the only such work he had ever read, and one which had emphasized the fourth dimension rather than velocity-mass ratios.