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A building separate from but associated with a main building.
(Architecture) a building subordinate to but separate from a main building; outhouse
a detached building subordinate to a main building.
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|Noun||1.||outbuilding - a building that is subordinate to and separate from a main building|
building, edifice - a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"
carriage house, coach house, remise - a small building for housing coaches and carriages and other vehicles
garage - an outbuilding (or part of a building) for housing automobiles
earth-closet, jakes, outhouse, privy - a small outbuilding with a bench having holes through which a user can defecate
shed - an outbuilding with a single story; used for shelter or storage