adjective Statistics.
of or pertaining to a process involving a randomly determined sequence of observations each of which is considered as a sample of one element from a probability distribution.

1655–65; < Greek stochastikós, equivalent to stochas- (variant stem of stocházesthai to aim at) + -tikos -tic

stochastically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stochastic (stɒˈkæstɪk)
1.  statistics
 a.  (of a random variable) having a probability distribution, usually with finite variance
 b.  (of a process) involving a random variable the successive values of which are not independent
 c.  (of a matrix) square with non-negative elements that add to unity in each row
2.  rare involving conjecture
[C17: from Greek stokhastikos capable of guessing, from stokhazesthai to aim at, conjecture, from stokhos a target]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1662, "pertaining to conjecture," from Gk. stokhastikos "able to guess, conjecturing," from stokhazesthai "guess," from stokhos "a guess, aim, target, mark," lit. "pointed stick set up for archers to shoot at" (see sting). The sense of "randomly determined" is first recorded
1934, from Ger. Stochastik.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
stochastic   (stō-kās'tĭk)  Pronunciation Key 
  1. Involving or containing a random variable or variables.

  2. Involving chance or probability.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

stochastic definition


The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Astrophysics doesn't require stochastic differential equations.
Open source communities are hierarchical, not stochastic.
The effect is known as stochastic resonance, and it occurs in electronic circuits, global climate models and nerve cells.
Renewables are also stochastic, which means you have to lot of conventional
  power plants as back up.
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