setback

ot noun

1. An 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. A step-like recession in a wall. Setbacks were initially used for structural reasons, but now are often mandated by land use codes.
3. The required distance between a structure and a road.
4. An offset to the temperature setting of a thermostat to cover a period when more or less heating is required than usual.