The Collaborative International Dictionary of English v.0.48:

Abstinent \Ab"sti*nent\, a. [F. abstinent, L. abstinens, p. pr.
   of abstinere. See Abstain.]
   Refraining from indulgence, especially from the indulgence of
   appetite; abstemious; continent; temperate. --Beau. & Fl.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Abstinent \Ab"sti*nent\, n.
   1. One who abstains.
      [1913 Webster]

   2. (Eccl. Hist.) One of a sect who appeared in France and
      Spain in the 3d century.
      [1913 Webster]

WordNet (r) 3.0 (2006):

abstinent
    adj 1: self-restraining; not indulging an appetite especially
           for food or drink; "not totally abstinent but abstemious"
           [syn: abstinent, abstentious]
    n 1: a person who refrains from drinking intoxicating beverages
         [syn: abstainer, abstinent, nondrinker] [ant:
         drinker, imbiber, juicer, toper]