What is Averia?

Legal Definition
Cattle. This word, in its most enlarged signification is used to include horses of the plough, oxen and cattle. Cunn. Dict. h. t.
-- Bouviers Law Dictionary
Legal Definition
In old English law. This term was applied to working cattle, such as horses, oxen, etc,
See also
-- Black's Law Dictionary
Legal Definition
Cattle.
-- Ballentine's Law Dictionary