The complete apparatus used to control a mechanism or machine in operation, as a flying machine in flight;

the mechanism controlling the rudders and ailerons.

the name given to that part of design and technology concerned with making mechanical, electrical and electronic devices work in the way they were intended

In human-machine interaction, a mechanism for regulating or guiding the operation of a tool, apparatus, machine or other system; examples include push button, switch, knob, wheel, lever, and pedal.

a mechanism that controls the operation of a machine; "the speed control on his turntable was not working properly"; "I turned the controls over to her"

handle and cause to function; "do not operate machinery after imbibing alcohol"; "control the lever"

In general terms, it is a mechanism used to ensure various processes/systems operate as designed.

the name given to that part of design and technology concerned with the way mechanical, electrical and electronic devices work; hence control technology.