E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
as a land measure, was no certain quantity, but as much as an ox could gang over or cultivate. Also called a bovate. The Latin jugum was a similar term, which Varro defines Quod juncti boves uno die exarre: possunt.
Eight oxgangs made a carucate. If an oxgang was as much as one ox could cultivate, its average would be about fifteen acres.