What is Bovata Terrae?

Legal Definition
As much land as one ox can cultivate. Said by some to be thirteen, by others eighteen, acres in extent. Skene; Spelman; Co. Litt 5a.
-- Black's Law Dictionary
Legal Definition
As much land as one ox can plough.
-- Bouviers Law Dictionary
Legal Definition
Land tillable by one ox.
-- Ballentine's Law Dictionary