1a n. the line marking the side boundary of a concession (def. 2) and running at right angles to the concession line (def. 1).
See also: concession (def. 2) concession line (def. 1)
1b n. the side boundary of a lot.
2 n. in Ontario, a road built along the side boundaries of a concession (def. 2) at right angles to a concession road.
See also: side-road (def. 2)