— instantaneity /in stan'tn ee"i tee, in'steuhn teuh nee"-/ , instantaneousness , n. — instantaneously , adv.
/in'steuhn tay"nee euhs/ , 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.
[ 1645-55; instantaneus. See INSTANT, -AN, -EOUS ]
Syn. 1. immediate, sudden, abrupt.