Acrefight or Acre
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A camp or field fight; a sort of duel or judicial combat, anciently fought by single combatants, English and Scotch, between the frontiers of the two kingdoms with sword and lance. Called "campfight," and the combatants "champions," from the open field that was the stage of trial. CowelL