A single keystroke.
keystroke definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of the individual strokes made in operating a keyboard, as of a computer terminal
keystroke definition by American Heritage Dictionary
A stroke of a key, as on a computer keyboard.
- keyˈstrokeˌ verb