power

The word 'power' traces a direct line from the Proto-Indo-European concept of mastery to the modern English language's most versatile political term.‌​‌​‌​‍​‌​‍​‌​‌​‍​‌​‍​‍​‌​‌​‌​‌​‌​‍​‌​‍​‍​‌​‍​‍​‌​‌​‍​‌​‌​‌​‌​‌ It enters Middle English from Anglo-French 'poer' or 'poeir,' a nominalized form of the Old French verb 'poeir' (to be able), from Vulgar Latin *potēre, a regularization of Classical Latin 'posse' (to be able, to have power). Latin 'posse' is itself a contraction of 'potis' (powerful, able, master) + 'esse' (to be) — power is, at its etymological core, 'the state of being able.'

The PIE root *poti- (powerful, lord, master) is one of the great political roots of the Indo-European family. In Sanskrit, 'pati' means 'lord' or 'husband' — the master of the household. In Greek, 'pósis' (πόσις) means 'husband,' and the compound 'despótēs' (δεσπότης) — from *dems-poti-, 'lord of the house' — gave English 'despot,' a word that began as a neutral domestic title (master of the household) before acquiring its modern connotation of tyrannical rule. In Latin, *poti- produced 'potis' (able, powerful), 'potēns' (powerful, potent), 'potentia' (power, might), and the entire family of words built on 'posse': 'possible' (able to be done), 'impossible,' 'omnipotent' (all-powerful), 'impotent' (without power), and 'possess' (from Latin 'possidēre,' to sit as master, perhaps from *poti- + 'sedēre,' to sit).

The semantic range of 'power' in English is extraordinarily broad. It can denote physical strength, political authority, legal right, electrical energy, mathematical exponents, and supernatural ability. This breadth reflects the original abstractness of the root: *poti- named not a specific kind of strength but the general condition of mastery — the capacity to act, regardless of the domain.

The French doublet is revealing. English borrowed 'power' from Norman French 'poeir' in the thirteenth century, but French also preserved the word as 'pouvoir' (the modern French verb 'to be able' and noun 'power'). The archaic adjective 'puissant' (powerful, mighty), common in Shakespeare, comes from the Old French present participle of 'poeir.' So English has three layers from the same Latin root: 'power' (the Norman noun), 'puissant' (the Old French adjective, now archaic), and the learned Latin borrowings 'potent,' 'potential,' and 'omnipotent.'

The political history of the word mirrors its etymology. In medieval usage, 'power' most commonly referred to the ability or authority granted by God, law, or feudal obligation — power was delegated, not inherent. The modern sense of power as something seized, accumulated, and wielded — power as a quantity to be gained or lost — emerged more fully in the early modern period, particularly in the political philosophy of Machiavelli and Hobbes. Hobbes defined power as 'present means to obtain some future apparent good,' an instrumental definition that would have been foreign to medieval usage. The word's journey from 'the state of being able' to 'the means of domination' tracks the secularization of Western political thought.