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Meaning of backset

back•set

Pronunciation: (bak'set"), [key]
— n.
    1. a setback; relapse; reverse.
    2. an eddy or countercurrent.
  1. (on a lock on a door or the like) the horizontal distance between the face through which the bolt passes and the center line of the knob stem or keyhole.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.