A mechanism in a system that monitors performance inputs rather than outputs, and reacts so as to maintain a specified state, thus preventing or minimising problems before they occur.

(officialese, law) A drug or chemical whose use, possession, manufacture, or sale is regulated or banned by the government.

manipulated or regulated directly by the mind.

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

Any control, either formal or informal, that is exerted by a group, especially by one's peers

(computing) A character which does not have a direct visual appearance as a glyph, but rather causes some other action to occur, such as a transition to a new line.

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

(information science) A carefully selected set of terms - words and phrases - such that each concept from the domain of discourse is described using only one term in the set and each term in the set describes only one concept.

The use of radio signals to remotely control a device.

Controlled remotely using radio signals.