Average

[L. Lat. averagium, from avera, or averia, qq. v.] In old English law. A service by horse or carriage, anciently due by a tenant to his lord.

Cowell.

A labor or service performed with working cattle, (opus quod averiis perficitur,) horses or oxen, or with wagons and carriages. Spelman, voc.

Avera.