1. individually owned apartment: an individually owned unit of real estate, especially an apartment or town house, in a building or on land that is owned in common by the owners of the units
2. building containing condominiums: a building or complex containing condominium apartments or town houses
3. state ruled by foreign countries: a country governed by two or more different countries with joint responsibility
4. joint government of territory: the system under which a country or state is ruled by two or more other nations
[Early 18th century. < modern Latin, "joint right of ownership" < Latin dominium (see dominion)]