The Collaborative International Dictionary of English v.0.48:

Undergraduate \Un`der*grad"u*ate\, n.
   A member of a university or a college who has not taken his
   first degree; a student in any school who has not completed
   his course. Contrasted with graduate student.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Undergraduate \Un`der*grad"u*ate\, a.
   Of or pertaining to an undergraduate, or the body of
   undergraduates.
   [1913 Webster]

WordNet (r) 3.0 (2006):

undergraduate
    n 1: a university student who has not yet received a first
         degree [syn: undergraduate, undergrad]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "undergraduate":
   autodidactic, bookish, cadet, college-bred, collegiate, freshman,
   graduate, junior, learned, midshipman, plebe, postgraduate,
   schoolboyish, schoolgirlish, senior, soph, sophomore, sophomoric,
   studentlike, studious, undergrad, upperclassman