[man.sion] n [ME, fr. MF, fr. L mansion-, mansio, fr. manere to remain, dwell; akin to Gk menein to remain] (14c) 1 a obs: the act of remaining or dwelling: stay b archaic: dwelling, abode
2. a (1): the house of the lord of a manor (2): a large imposing residence b: a separate apartment or lodging in a large structure 3 a: house 3b b: one of the 28 parts into which the moon's monthly course through the heavens is divided