Definition of stochastic

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sto·chas·tic    (st-kstk) KEY 

ADJECTIVE:

1. Of, relating to, or characterized by conjecture; conjectural.
2. Statistics
   1. Involving or containing a random variable or variables: stochastic calculus.
   2. Involving chance or probability: a stochastic stimulation.

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ETYMOLOGY:
Greek stokhastikos, from stokhasts, diviner, from stokhazesthai, to guess at, from stokhos, aim, goal; see stegh- in Indo-European roots

OTHER FORMS:
sto·chasti·cal·ly(Adverb)