IPA: /ˈkiːstroʊk/
KK: /ˈkiːstroʊk/
A single action of pressing a key on a keyboard.
Each keystroke is recorded when you type on your computer.
Keystroke is formed from "key" (from Old English "cæg", meaning a device for opening) and "stroke" (from Old English "strōc", meaning a blow or hit). The word "keystroke" refers to the action of pressing a key on a keyboard, akin to making a hit or press with a device that opens or activates something.
Think of a 'key' as a device that opens something and a 'stroke' as a hit or press — together, they describe the action of pressing a key.