Definition of: stochastic

(stō·kas′tik) adjective
1. Of, pertaining to, characterized by, or skilled in conjecture; conjectural.
2. Physics Subject to the laws of probability; not predictable within a given time limit or spatial framework, as the disintegration of a single radioactive element: the stochastic phenomena of microphysics.
3. Denoting the process of selecting, from among a group of theoretically possible alternatives, those elements or factors whose combination will most closely approximate a desired result: a stochastic model. [<Gk. stochastikos <stochazesthai guess at <stochos mark, aim]