Avera
A New Law Dictionary and Glossary · Alexander M. Burrill · 1850
A New Law Dictionary and Glossary
Lat. [from Fr. ouvre, ouvrage, labor, work.] In old English law. A day's work of a ploughman; a kind of customary service rendered by the king's tenants within the demesne lands of the crown.
Domesday. Spelman. Cowell.