from the GNU version of the Collaborative International Dictionary of English
- n. A proclamation, as of the French kings, calling not only their immediate feudatories, but the vassals of these feudatories, to take the field for war; also, the body of vassals called or liable to be called to arms, as in ancient France.
from The Century Dictionary and Cyclopedia
- n. In the early feudal state, the summons of the sovereign to all freemen, calling them to the field with their vassals, equipment, and three months' provisions. Neglect to obey the summons brought fines or even loss of the fief. Hence The military force thus liable to be called out. Formerly written arierban.
Sorry, no etymologies found.
I hear that the nobles are taxed and condemned by petty judges, contrary to the privileges of their condition, forced to the arriere-ban, despite the ancient customs. "