Stochastic /(stō̇*kăs"tĭk)/

Sto·chas·tic

Stochastic

a.
  1. Conjectural; able to conjecture. [Obs.]
  2. random; chance; involving probability; opposite of deterministic.
  3. of or pertaining to a process in which a series of calculations, selections, or observations are made, each one being randomly determined as a sample from a probability distribution. (Statistics)