Source : Webster's Revised Unabridged Dictionary (1913)

Erasure \E*ra"sure\, n.
   An instance of erasing; also, the place where something has
   been erased.

Erasure \E*ra"sure\ (?; 135), n. [From {Erase}.]
   The act of erasing; a scratching out; obliteration.

Source : WordNet®

erasure
     n 1: a correction made by erasing; "there were many erasures in
          the typescript"
     2: a surface area where something has been erased; "another
        word had been written over the erasure"
     3: deletion by an act of expunging or erasing [syn: {expunction},
         {expunging}]