Federacy is a term that refers to a system of government in which power is divided between a central authority and constituent political units. Its antonyms are mainly associated with the absence of power-sharing or the presence of absolute control by one unit. Some of the antonyms of federacy include dictatorship, autocracy, monarchy, oligarchy, tyranny, and despotism. These forms of government usually have a single leader or ruling elite who exercises complete or almost complete authority over the entire territory, resulting in limited or no participation by the citizens in the decision-making process. In contrast, federacy allows for collaboration and negotiation between central authority and different political units, promoting democracy and a sense of shared power among its constituents.