control key

noun
variants: or less commonly Control key

Definition of control key 

: a key on a computer keyboard that when pressed in combination with other keys enables special commands or symbols to be accessed Pressing "z" while holding down the control key often undoes the last action. abbreviation Ctrl — compare alt key

First Known Use of control key

1978, in the meaning defined above

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The first known use of control key was in 1978

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