The Collaborative International Dictionary of English v.0.48:

Exuperate \Ex*u"per*ate\, v. t. [L. exuperatus, exsuperatus, p.
   p. of exuperare, exsuperare to excel; ex out + superare to go
   over, super above, over.]
   To excel; to surmount. [Obs.]
   [1913 Webster]