- Probabilist Prob"a*bil*ist, n. [Cf. F. probabiliste.]
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. [1913 Webster]
The Collaborative International Dictionary of English. 2000.