1. A dwelling place, -- whether a part or whole of a house or other shelter. [Obs.] In my Father's house are many mansions. John xiv. 2. These poets near our princes sleep, And in one grave their mansions keep. Den 2. The house of the lord of a manor; a manor house; hence: Any house of considerable size or pretension. 3. (Astrol.) A twelfth part of the heavens; a house. See 1st House, 8. Chaucer....