The Collaborative International Dictionary of English v.0.48:
Adventist \Ad"vent*ist\, 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]WordNet (r) 3.0 (2006):
Adventist n 1: a member of Christian denomination that expects the imminent advent of Christ [syn: Adventist, Second Adventist]