Dictionary
in•stan•ta•ne•ous
Pronunciation: (in"stun-tā'nē-us), [key]—
adj.
1. occurring, done, or completed in an instant:
an instantaneous response.
2. existing at or pertaining to a particular instant:
the instantaneous position of the rocket. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.