one of the dwelling units in a condominium
"Each resident holds title to their own private apartment within the larger condominium complex."
housing consisting of a complex of dwelling units (as an apartment house) in which each unit is individually owned
"The family moved into their new condominium, where they hold title to their individual apartment while sharing ownership of the building's common areas."
Joint sovereignty over a territory by two or more countries.
"The disputed island was eventually declared a condominium, allowing both neighboring nations to exercise joint sovereignty over its territory."
In plain English: A condominium is an apartment building where each owner owns their specific unit but shares ownership of common areas with everyone else living there.
"We bought our first home in a condominium near the beach."
Usage: In modern English, this term almost exclusively refers to an apartment in a shared building rather than the political concept of joint sovereignty; use "co-sovereignty" if discussing international borders. The residential meaning is standard in casual and formal contexts alike.
The word comes from the Latin condominium, which originally meant a property jointly owned by two or more people. It entered English with this same sense of shared ownership rather than describing modern residential complexes.