Mansion

UK: /ˈmænʃ^ən/ US: /ˈmænʃən/ ,(man′shən)

WordReference Random House Learner's Dictionary of American English © 2026

man•sion /ˈmænʃən/   n. [countable]

1. a very large or stately house as a place to live.
2. British Terms Often, mansions. [plural] [Chiefly Brit.] apartment house.

WordReference Random House Unabridged Dictionary of American English © 2026

man•sion  (man′shən), n. 

1. a very large, impressive, or stately residence.
2. World History See manor house. 
3. British Terms Often, mansions. a large building with many apartments;
   apartment house.
4. Oriental and Medieval Astron. each of 28 divisions of the ecliptic occupied by the moon on successive days.
5. [Archaic.] an abode or dwelling place.

• Latin mānsiōn- (stem of mānsiō) an abiding, abode. See manse, -ion
• Middle English 1325–75

Collins Concise English Dictionary © HarperCollins Publishers::

mansion / ˈmænʃən/ noun

1. Also called: mansion house a large and imposing house
2. a less common word for manor house
3. (plural) a block of flats

Etymology: 14th Century: via Old French from Latin mansio a remaining, from mansus; see manse