[CO- 1, 3 a.] Co-operative plowing; = CO-ARATION.
1883. Seebohm, Eng. Vill. Commun., IV. iii. 121. And those who join in co-ploughing must bring a proper contribution. Ibid., 124. According to the Welsh laws it [the erw or acre] was the measure of a day’s co-ploughing.
