man·sion 
(mănshən)
(mănshən)n.
1. A large stately house.
2. A manor house.
3. Archaic
a. A dwelling; an abode.
b. A separate dwelling in a large house or structure.
4.
a. See house.
b. Any one of the 28 divisions of the moon's monthly path.
[Middle English mansioun, a dwelling, from Old French mansion, from Latin mānsiō, mānsiōn-, from mānsus, past participle of manēre, to dwell, remain; see men-3 in the Appendix of Indo-European roots.]