keystroke

[kee-strohk]
noun
one stroke of any key on a machine operated by a keyboard, as a typewriter, computer terminal, or Linotype: I can do 3000 keystrokes an hour.

Origin:
1905–10; key1 + stroke1

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World English Dictionary
keystroke (ˈkiːˌstrəʊk)
 
n
a single operation of the mechanism of a typewriter or keyboard-operated typesetting machine by the action of a key

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
With a keystroke, he can inflict all sorts of complications, overriding any
  preprogrammed instructions.
Financial markets are said to be more volatile as money moves across borders
  with a mere computer keystroke.
Software that recognises facial features and keystroke rhythms stops candidates
  being impersonated by professional exam sitters.
Using this information, they were able to figure out a list of potential
  keystroke pairs.
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