Definitions
1.nounA 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."I turned the key, the lock gave a click and the door opened; a click of one’s fingers"
2.nounAn ingressive sound made by coarticulating a velar or uvular closure with another closure.
3.nounSound made by a dolphin.
4.nounThe act of operating a switch, etc., so that it clicks.
5.nounThe act of pressing a button on a computer mouse, both as a physical act and a reaction in the software.
6.nounA pawl or similar catch.
7.nounA detent, pawl, or ratchet, such as that which catches the cogs of a ratchet wheel to prevent backward motion.
8.nounThe latch of a door.
9.nounA kilometer.
10.noun(usually in the plural) Kilometres per hour.