governor

n. one who governs; executive head of a state (USA); device which automatically regulates speed (Machinery)

A governor or governour (archaic) is a governing official, usually the executive (at least nominally, to different degrees also politically and administratively) of a non-sovereign level of government, ranking under the Head of state. The title also applies to officials with a similar mandate as representatives of a chartered company which has been granted exercise of sovereignty in a colonial area, such as the British HEIC or the Dutch VOC. Sometimes these companies operate as a major state within a state with its own armed forces.
See more at Wikipedia.org...

Noun
1. the head of a state government
(hypernym) politician
(hyponym) bey
(derivation) govern, rule
2. a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
(synonym) regulator
(hypernym) control, controller
(hyponym) timer
(derivation) regulate, regularize, regularise, order, govern

(n.)
One who has the care or guardianship of a young man; a tutor; a guardian.
  

(n.)
One who governs; especially, one who is invested with the supreme executive authority in a State; a chief ruler or magistrate; as, the governor of Pennsylvania.
  

(n.)
A pilot; a steersman.
  

(n.)
A contrivance applied to steam engines, water wheels, and other machinery, to maintain nearly uniform speed when the resistances and motive force are variable.
  

A device which limits the speed of an engine. A governor is also a part on an automatic transmission which signals internal transmission components to shift to a higher gear. (GSA2)