Longman Dictionary of Contemporary English
country seat
noun
EXAMPLES FROM CORPUS
▪ He invested his business gains in building up an estate, purchasing as a country seat the former Carmelite priory of Aylesford.
The Collaborative International Dictionary
Country seat
Country seat \Coun"try seat`\ (k?n"tr? s?t`). A dwelling in the country, used as a place of retirement from the city.
Wiktionary
country seat
n. A second home in a rural area, especially one of a rich, powerful or important person
Usage examples of "country seat".
He had rented a proper country seat, Richmond Hill, a mile north of town on a high promontory beside the Hudson, with sweeping views and nearly always a breeze.