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

(aeronautics) A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw.

(idiomatic) Being taken care of or being addressed. / (literally) Being actively controlled, or able to be actively controlled in its current state.

(programming) A structure used to affect the flow of a program.

plural of control character

The line which separates the Indian-administered union territories of Jammu and Kashmir and Ladakh from Pakistani-administered territories of Azad Kashmir and Gilgit-Baltistan.

(engineering) The subfield of engineering concerned with designing and building controllers and control systems.

plural of board of control

A small executive body in municipal government, usually dealing with financial and administrative matters.

(UK, law) A nominated person who determines the purposes for which and the manner in which any personal data is to be processed. (under the Data Protection Act)