Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
Supposed to be a distance of 2, 000 cubits, or less than half-a-mile, the distance to which, according to Jewish tradition, it was allowable to travel on the Sabbath day without violating the law (Acts 1:12; comp. Ex. 16:29; Num. 35:5; Josh. 3:4).