KLIK

A brief, sharp, not particularly loud, relatively high-pitched sound produced by the impact of something small and hard against something hard, such as by the operation of a switch, a lock or a latch, or a finger pressed against the thumb and then released to strike the hand.

Example: "I turned the key, the lock gave a click and the door opened;  a click of one’s fingers"

An ingressive sound made by coarticulating a velar or uvular closure with another closure.

Sound made by a dolphin.

The act of operating a switch, etc., so that it clicks.

The act of pressing a button on a computer mouse, both as a physical act and a reaction in the software.

A pawl or similar catch.

A detent, pawl, or ratchet, such as that which catches the cogs of a ratchet wheel to prevent backward motion.

The latch of a door.

A kilometer.

(usually in the plural) kilometres per hour.