The Collaborative International Dictionary of English v.0.48:

Uncover \Un*cov"er\, v. t. [imp. & p. p. Uncovered; p. pr. &
   vb. n. Uncovering.] [1st pref. un- + cover.]
   1. To take the cover from; to divest of covering; as, to
      uncover a box, bed, house, or the like; to uncover one's
      body.
      [1913 Webster]

   2. To show openly; to disclose; to reveal. "To uncover his
      perjury to the oath of his coronation." --Milton.
      [1913 Webster]

   3. To divest of the hat or cap; to bare the head of; as, to
      uncover one's head; to uncover one's self.
      [1913 Webster]

WordNet (r) 3.0 (2006):

uncovering
    n 1: the removal of covering [syn: denudation, stripping,
         uncovering, baring, husking]
    2: the act of discovering something [syn: discovery, find,
       uncovering]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "uncovering":
   apocalypse, baring, bringing to light, casual discovery, catching,
   chance discovery, denudation, desquamation, detection,
   determination, determining, disclosing, disclosure, discovering,
   discovery, distinguishment, divestment, espial, excavation,
   excoriation, exfoliation, exhibitionism, exhumation, expose,
   exposition, exposure, find, finding, finding out,
   indecent exposure, invention, laying bare, locating, location,
   lucky strike, manifestation, patefaction, recognition, rediscovery,
   removal, removing the veil, revealing, revealment, revelation,
   serendipity, showing up, showup, spotting, strike, stripping,
   treasure trove, trouvaille, trove, uncloaking, unearthing,
   unfolding, unfoldment, unmasking, unveiling, unwrapping