Webster's English Dictionary

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mansion

man.sion \'man-ch*n\ n [ME, fr. MF, fr. L mansion-, mansio, fr. mansus, pp. 
   of ma]ne-re to remain, dwell; akin to Gk menein to remain obs  1a: the act 
   of remaining or dwelling : STAY  archaic  1b: ABODE  2a1: the house of the 
   lord of a manor  2a2: a large imposing residence  2b: a separate apartment 
   or lodging in a large structure  3a: HOUSE  3b: one of the 28 parts into 
   which the moon's monthly course through the he avens is divided