Definitions
1.nounAn obstacle, delay, disadvantage, blow (an adverse event which retards or prevents progress towards a desired outcome)"After some initial setbacks, the expedition went safely on its way."
2.nounThe required distance between a structure and a road.
3.nounA step-like recession in a wall."Setbacks were initially used for structural reasons, but now are often mandated by land use codes."
4.nounAn offset to the temperature setting of a thermostat to cover a period when more or less heating is required than usual.
5.noun(possibly obsolete) A backset; a countercurrent; an eddy.
6.nounA backset; a check; a repulse; a relapse.