Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A large new house, usually constructed as part of a suburban development and characterized by ostentation rather than quality of workmanship or architectural distinction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun informal A large, imposing and ostentatious house that lacks architectural integrity

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Mc(Donald's), trademark of a fast-food restaurant chain (from its mass-produced nature) + mansion.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

By analogy with McJob

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