the world > relative properties > measurement > measurement of area > [noun] > a system or process of measuring land > specific (2)
A piece of land having an annual rental value of one mark. Hence also: a unit of land based on this value, used in land assessment (see quot. 1944).
a land-measure formerly used in the plantations of Ireland, in which an acre contained 7840 square yards (approx. 6550 square metres).