Webster's Revised Unabridged Dictionary · 1913

Mansion

Mansion , noun

[Old French mansion, French maison, from Latin mansio a staying, remaining, a dwelling, habitation, from manere, mansum, to stay, dwell; akin to Greek {not transcribed}. Compare Manse, Manor, Menagerie, Menial, Permanent.]

1.
A dwelling place, -- whether a part or whole of a house or other shelter. [Obsolete]
In my Father's house are many mansions. — John xiv. 2
These poets near our princes sleep, And in one grave their mansions keep. — Denham
2.
The house of the lord of a manor; a manor house; hence: Any house of considerable size or pretension.
3.
(Astrology) A twelfth part of the heavens; a house. See 1st House, 8. — Chaucer
4.
The place in the heavens occupied each day by the moon in its monthly revolution. [Obsolete]
The eight and twenty mansions That longen to the moon. — Chaucer
Collocations (1)
Mansion house , the house in which one resides; specifically, in London and some other cities, the official residence of the Lord Mayor. — Blackstone

Mansion , intransitive verb

To dwell; to reside. [Obsolete] — Mede