/ ˈmænʃn; NAmE / noun
1.
[ C ] a large impressive house :
an 18th century country mansion
2.
Mansions [ pl. ] ( BrE ) used in the names of blocks of flats :
2 Moscow Mansions, Cromwell Road
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WORD ORIGIN
late Middle English (denoting the chief residence of a lord): via Old French from Latin mansio(n-) place where someone stays, from manere remain.