instantaneous

[in-stuhn-tey-nee-uhs]
adjective
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.

Origin:
1645–55; < Medieval Latin instantāneus. See instant, -an, -eous

instantaneity [in-stan-tn-ee-i-tee, in-stuhn-tuh-nee-] , instantaneousness, noun
instantaneously, adverb


1. immediate, sudden, abrupt.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
instantaneous (ˌɪnstənˈteɪnɪəs)
 
adj
1.  occurring with almost no delay; immediate
2.  happening or completed within a moment: instantaneous death
3.  maths
 a.  occurring at or associated with a particular instant
 b.  equal to the limit of the average value of a given variable as the time interval over which the variable is considered approaches zero: instantaneous velocity
 
instan'taneously
 
adv
 
instan'taneousness
 
n
 
instantaneity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Forty years ago, instantaneous global communication was possible but costly,
  and restricted to governments and large corporations.
And the full benefits of a cheaper currency have not been instantaneous.
Her recovery from respiratory failure is nearly instantaneous.
Some scenarios imagine the almost instantaneous failure of the systems that
  keep the modern world turning.
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