*potēre

English 'power' comes from Anglo-Norman poer, from Vulgar Latin *potēre, a restructured form of Latin posse (to be able), from potis (able, capable). The same root produced 'possible,' 'potent,' 'potential,' and 'despot' (from Greek despótēs, which may share a remote ancestor). Power is ability. That is the full etymology. Everything else — domination, control, violence — is what people do with the ability, not what the word means.

Max Weber defined power in 1922 as 'the probability that one actor within a social relationship will be in a position to carry out his own will despite resistance.' This is the sociological definition, and it adds to the etymological one: power is ability, and specifically the ability to get your way when someone is trying to stop you. Michel Foucault complicated this further in the 1970s, arguing that power is not possessed but exercised, not located but distributed. Power is not a thing. It is a relationship.

The physical meaning — power as energy, force, or work per unit time — was formalized by James Watt in the 1780s. Horsepower, kilowatts, megawatts — these are measures of the ability to do physical work. The political and physical meanings share the same root and the same logic: power is the ability to make something happen. A 200-horsepower engine can move a car. A powerful politician can move a law. The verb is the same.

The word's range is so wide that it functions as a semantic wild card. Power outage. Power nap. Power suit. Power ballad. Superpower. Purchasing power. Flower power. In each compound, 'power' means something slightly different: energy, strength, authority, influence, capacity, intensity. The word accommodates all of these because the Latin root — to be able — is broad enough to contain them.