Noun

1. A brief, sharp, not particularly loud, relatively high-pitched sound produced by the impact 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. An ingressive sound made by coarticulating a velar or uvular closure with another closure.
3. Sound made by a dolphin.
4. The act of operating a switch, etc., so that it clicks.
5. The act of pressing a button on a computer mouse.
6. A kilometre.

   The term is used in countries that have adopted the metric system. In USA, it is commonly used in war and science fiction films; for example, the target is 5 clicks north.

7. The term used to show approval, acceptance, or general agreement.

Verb

1. To cause to make a click, eg to operate (a switch, etc) so that it makes a click.
2. (direct and indirect) To press and release (a button on a computer mouse).
   1. To select a software item using, usually, but not always, the pressing of a mouse button.
   2. To visit a web site. (Used in Advertising)

      Visit a location, call, or click www.example.com

3. To emit a click.

   He bent his fingers back until the joints clicked.

4. To click the left button of a computer mouse while pointing.

   Click here to go to the next page.

5. To make sense suddenly.

   Then it clicked - I had been going the wrong way all that time.

6. To get on well at a first meeting.

   When we met at the party, we just clicked and we’ve been best friends ever since.