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A large new house, usually constructed as part of a suburban development and characterized by ostentation rather than quality of workmanship or architectural distinction.
[Mc(Donald's), trademark of a fast-food restaurant chain (from its mass-produced nature) + mansion.]
(Architecture) informal derogatory a large modern house considered to look mass-produced, lacking in distinguishing characteristics, and at variance with established local architecture
[C20: a corruption of McDonald's, a major American fast-food enterprise noted for the ubiquity of its restaurants]