key in Catalan

Indispensable, supremely important.

(countable) An object designed to open and close a lock.

(computing) One of several small, usually square buttons on a typewriter or computer keyboard, mostly corresponding to text characters.

In instruments with a keyboard such as an organ or piano, one of the levers, or especially the exposed front end of it, which are depressed to cause a particular sound or note to be produced.

In instruments with a keyboard such as an organ or piano, one of the levers, or especially the exposed front end of it, which are depressed to cause a particular sound or note to be produced.