As in ground laid aside for the public weal. We have, for instance, Southsea Common here in my home town of Portsmouth. I can’t recall seeing this word in an American context. Do you guys use the term in this sense?
Just down the road from here is the town of Brunswick.
By their vote of May 8, 1719, the Pejepscot Proprietors “Granted one thousand acres of land to ly in general comonage.” Unlike the village green or town common found in the center of many New England towns, the Brunswick Town Commons was a specific grant from the private lands of the Pejepscot Co., and not from town-owned common and undivided land.
Located near the geographic center of town, the Commons has influenced the growth of the Brunswick region. Upon the promise of two hundred acres of land from the Commons, Bowdoin College was established in Brunswick. In the late 1800’s the Town appropriated money to plant and cultivate blueberries on the Commons.