A castle; a country seat.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
A nobleman's castle: a country- seat.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (noun) (n.) (noun)

Usage examples:

I could then take some of the men with me, and ride as quickly as the light will allow up to the chateau and take possession of it, of Capet, and of those who are with him.
- El Dorado by Baroness Orczy
The horse cleared the comte's motionless body, and bore De Wardes rapidly back to the chateau
- Louise de la Valliere by Alexandre Dumas, Pere
The fact that chateau cottage, field, and tree are all equally sacred would then be brought home in every way to the ignorant; they would be made to understand that Right is just the same in all cases, whether the value of the property in question be large or small.
- The Country Doctor by Honore de Balzac