[1] : The Collaborative International Dictionary of English v.0.48

adventist \ad"ventist\, n.
   one of a religious body, embracing several branches, who look
   for the proximate personal coming of christ; -- called also
   second adventists. --schaff-herzog encyc.
   1913 webster
see also:
second adventists 

[2] : WordNet (r) 2.0

adventist
     n : a member of christian denomination that expects the imminent
         advent of christ syn: second adventist
see also:
second adventist 

Adventist >> A Words
Adventist, definition of term: Adventist
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