Definition of "holdover"

holdover

noun
countable and uncountable, plural holdovers
1. (countable) Something left behind, saved or remaining from an earlier time.
  Quotations
  Castle Rock Middle School was a frowning pile of red brick standing between the Post Office and the Library, a holdover from the time when the town elders didn't feel entirely comfortable with a school unless it looked like a reformatory.
  1991, Stephen King, Needful Things
2. (firearms) The distance (at target) by which a rifle scope is aimed higher than the intended point of impact in order to compensate for bullet drop over the distance to the target.