From Citizendium - Reading time: 1 min
A mansion can be:
It derives from the same Latin source as the words manor and manse, the noun mansio, mansionis, from manere, to remain.
A mansion is a large house, but beyond that its use is subjective and can be pejorative: today, the word is mainly used by those in the real estate trade.
For a discussion of the history and use of the word mansion, the origin and development of the concept of mansions and the composition of their household staff, see great house.
For specific residential styles that are often or may be referred to as mansions, see: