n. A large, opulent house, especially a new house that has a size and style that doesn't fit in with the surrounding houses.
In a world of bloated S.U.V.'s and rambling McMansions, there are times when smaller is better.
—Steven E. Brier, “Nikon's New Digital Camera Fits Easily in a Pocket,” The New York Times, August 16, 2001
1990 (earliest)
In this dehumanizing, auto-dominated, market-research-driven age of faltering standards of service and aesthetics, our urban and suburban landscapes are becoming more homogenized and worse.

What character their history and ecology might offer is being strip-mined to make way for anonymous residential projects, monolithic office towers, climate-controlled retail complexes of questionable design and awkward transportation systems — all in the abused name of progress.

We are talking here of the march of mini-malls and 'McMansions.'
—Sam Hall Kaplan, “Search for Environmental View of Design,” The Los Angeles Times, July 17, 1990
The word McMansion has only been a part of the lexicon for a little over ten years, but it has already undergone a fairly significant change in meaning. In fact, the word's current meaning seems to be almost the opposite of its original sense. As the earliest citation shows, McMansion used to mean something similar to cookie-cutter house (that is, a house that has a bland style that's identical to all the nearby houses). This fits nicely with the formation of the word, which is McDonalds (the fast-food chain) + mansion. After all, what could be more bland and "cookie cutter" than the fare served by McDonalds?
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