Definify.com
Webster 1913 Edition
Probabilist
Prob′a-bil-ist
,Noun.
[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.