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
Enter the letters on your tile rack and instantaneously, words you probably
  never knew existed appear for your selection and use.
We see lightning instantaneously because it travels at the speed of light to
  our eyes.
Nearly instantaneously, both qubits would be in superposition and the coupling
  would be turned off.
The chips in the implant will receive signals from the collar and send them to
  a computer instantaneously.
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