WordNet (r) 3.0 (2006):

probabilistic
    adj 1: of or relating to the Roman Catholic philosophy of
           probabilism
    2: of or relating to or based on probability; "probabilistic
       quantum theory"

The Free On-line Dictionary of Computing (30 December 2018):

probabilistic
stochastic

    Relating to, or governed by, probability. The
   behaviour of a probabilistic system cannot be predicted
   exactly but the probability of certain behaviours is known.
   Such systems may be simulated using pseudorandom numbers.
   Evolutionary computation uses probabilistic processes to
   generate new (potential) solutions to a problem.

   See also deterministic, non-probabilistic.

   (1995-09-22)