Source : Webster's Revised Unabridged Dictionary (1913)

Voidance \Void"ance\, n.
   1. The act of voiding, emptying, ejecting, or evacuating.

   2. (Eccl.) A ejection from a benefice.

   3. The state of being void; vacancy, as of a benefice which
      is without an incumbent.

   4. Evasion; subterfuge. [Obs.] --Bacon.

Source : WordNet®

voidance
     n : the act of removing the contents of something [syn: {emptying},
          {evacuation}]