1. a residential building containing four separate dwelling units or apartments
Usage: also called a quadruplex; common in real estate and housing contexts

Examples

• They purchased a fourplex as an investment property to generate rental income.
• The fourplex on Maple Street has four identical units, each with its own entrance.
• Converting the old house into a fourplex required significant renovations and permits.
• The real estate agent showed us several fourplexes in the neighborhood.
• Living in a fourplex means sharing walls with three other families.