means A large country house with its surrounding lands, historically the centre of a feudal estate.

from From Anglo-Norman 'manoir,' which descends from Latin 'manere,' to stay or dwell — so a manor is literally a 'staying place,' the spot where the lord remained while everyone else worked the surrounding fields. The same Latin root for 'remaining' quietly survives in 'permanent' and 'mansion,' all of them about staying put.