(computing) Any of a set of keys on a personal computer or terminal keyboard used to activate a predefined or programmable function.

The key on a typewriter used to select uppercase letters and certain special characters by physically moving the mechanism

(computing) A key on a personal computer or terminal keyboard used in combination to modify the function of other keys; normally labelled "Ctrl"

(computing) A key on a personal computer or terminal keyboard used in combination to alter the function of other keys

Abbreviation of programmed (or programmable) function key.

(music) Pitched inaccurately either above or below the correct note. / (by extension) Not harmonious, or out of accord.

With inaccurate pitch.

(biology) A written tool for identification of plants and animals. It is written as a sequence of paired questions, the choice of which determines the next pair of questions until a name or identification is reached.

A very simple design of key that usually has a cylindrical shaft (sometimes called a "shank") and a single, minimal flat, rectangular tooth or "bit".

(music) A key using alternative fingerings for certain notes on woodwind instruments. Specifically, a key that is located between the first and second keys operated by the left hand on a saxophone. Pressing LH1 and the bis key simultaneously results in the sounding of a Bb. This is especially useful when playing in keys with many flats.