Source : Webster's Revised Unabridged Dictionary (1913)

Expunction \Ex*punc"tion\, n. [L. expunctio execution,
   performance, from expungere. See {Expunge}.]
   The act of expunging or erasing; the condition of being
   expunged. --Milton.

Source : WordNet®

expunction
     n : deletion by an act of expunging or erasing [syn: {expunging},
          {erasure}]