\Prob"a*bil*ist\, n. [Cf. F. probabilists.]
1. One who maintains that certainty is impossible, and that
   probability alone is to govern our faith and actions.
2. (Casuistry) One who maintains that a man may do that which
   has a probability of being right, or which is inculcated
   by teachers of authority, although other opinions may seem
   to him still more probable.