A powerful leader; a monarch; a ruler. / A powerful polity or institution. / (derogatory) A self-important person. / (humorous) Someone acting in an important role.

(obsolete) Regnant, powerful, dominant.

(chemistry, physics) the potential difference of a half-reaction which occurs across a reversible cell made up of any electrode and a standard hydrogen electrode

an electrode potential measured under standard conditions; a temperature or 298K, 1 atmosphere pressure and at 1 mole of the activity of redox participants of the half-reaction.

In a manner showing much potential; with the possibility of happening in a given way. / (obsolete) Powerfully, strongly.

the difference in potential energy between two points in an electric field; the difference in charge between two points in an electrical circuit; voltage

The energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass).

The potential energy in an electric cell or battery.

(electricity) The potential energy per unit charge at a point in a static electric field.

Possessing strength. / Powerfully effective. / Having a sharp or offensive taste. / (of a male) Able to procreate. / Very powerful or effective.