Keystroke (noun)

1. The action of pressing a key on a keyboard.
2. A measure of the number of key presses made by a user in a given period of time, used as a way to measure typing speed or as a form of authentication.

Origin:

From the combination of the words "key" and "stroke" to refer to the physical action of pressing a key on a keyboard.

Examples:

1. He typed the password with lightning keystrokes.
2. The keystroke log showed that the document was last modified by the secretary.
3. The typing test is based on the number of keystrokes per minute.
4. The keystroke dynamics is used for user authentication.
5. The software tracks the keystrokes to detect suspicious activities.