one of the dwelling units in a condominium
"The new condo features three bedrooms and a private balcony overlooking the city."
Clipping of condominium.
"The residents of the new condo complex are enjoying their spacious apartments and shared amenities."
A surname.
"The famous historian named Condo published her latest book on ancient Rome."
The word condo is simply a shortened form of the legal term condominium. It entered common usage as an informal way to refer to shared apartment buildings or residential complexes.