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Noun: accessory dwelling unit
Usage: N. Amer
  1. A self-contained apartment, cottage, or small residential unit located on a property that has a separate main house
    "They built an accessory dwelling unit in their backyard for their aging parents";
    - casita [N. Amer], ADU [N. Amer]

Derived forms: accessory dwelling units

Encyclopedia: Accessory dwelling unit