Borrowed from English mansion. The term gained currency in the latter half of the 1950s, used to lend an air of luxury to high-density residential development projects.
Note that while English mansion most commonly means “large house”, it is also occasionally used to mean “luxurious apartment”, and this latter usage was borrowed into Japanese.
マンション • (manshon)
- a condominium
- an apartment building
- a large apartment; a large flat
- 億ション (okushon): a high-end condominium
- ^ 1988, 国語大辞典（新装版） (Kokugo Dai Jiten, Revised Edition) (in Japanese), Tōkyō: Shogakukan
- ↑ 2.0 2.1 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, →ISBN
- ^ 2010: 日本の不動産業 (Nihon no Fudōsan Gyō, “Real Estate in Japan”; in Japanese), page 10; The Real Estate Companies Association of Japan.