1) The threshing floor in a barn. [< OldEngl. bere = barley + ton = an enclosure]
Cf. Barton2
2) A *demesne farm, i.e. one reserved for the lord's own use. Barton is still found in many placenames. [< OldEngl. bere = barley + ton = an enclosure]
Cf. Barton2; Caput honoris
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.