资料来源 : Webster's Revised Unabridged Dictionary (1913)

Invisibleness \In*vis"i*ble*ness\, n.
   The quality or state of being invisible; invisibility.

资料来源 : WordNet®

invisibleness
     n : the quality of not being perceivable by the eye [syn: {invisibility}]
         [ant: {visibility}]