1. a building or house divided into two separate living units, each with its own entrance
Usage: common in residential real estate
2. an apartment or flat that occupies two floors of a building
Usage: common in urban settings

1. having two parts or functioning in two ways; double
Usage: technical or formal usage

Examples

• They bought a duplex so they could rent out one unit and live in the other.
• The duplex apartment on the top two floors had high ceilings and plenty of natural light.
• A duplex communication system allows data to travel in both directions simultaneously.
• Many young families prefer duplexes because they offer more space than a typical apartment.
• The real estate agent showed us three duplexes in the neighborhood.
• This duplex design lets the building serve two separate households.