1archaic:commonweal 2 2: a nation, state, or other political unit: as a: one founded on law and united by compact or tacit agreement of the people for the common good b: one in which supreme authority is vested in the people c:republic 3capitalizeda: the English state from the death of Charles I in 1649 to the Restoration in 1660 b:protectorate 1b 4: a state of the United States —used officially of Kentucky, Massachusetts, Pennsylvania, and Virginia 5capitalized: a federal union of constituent states —used officially of Australia 6often capitalized: an association of self-governing autonomous states more or less loosely associated in a common allegiance (as to the British crown) 7often capitalized: a political unit having local autonomy but voluntarily united with the United States —used officially of Puerto Rico and of the Northern Mariana Islands