n (military|chiefly|plural) A building for soldiers, especially within a garrison; originally referred to temporary huts, now usually to a permanent structure or set of buildings.
n (chiefly|plural) primitive structure resembling a long shed or barn for (usually temporary) housing or other purposes
n (chiefly|plural) any very plain, monotonous, or ugly large building
n (US|regional) A movableroof sliding on four posts, to cover hay, straw, etc.