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Extropy is a proposed opposing concept to entropy. As entropy decreases , signifying more order, so extropy would increase in the manner of negentropy. Extropy also attempts to describe the nature of the order, so a crystal , although highly ordered would have low extropy, but an organism or machine would have high extropy because of the informational structure contained within it. Extropy also describes the tendency of systems to grow more organized. The idea was first introduced by philosopher and futurist Max More in the late 1980s.[1][2][3]

It gives its name to Extropianism , the philosophical belief that culture and technology will aid the universe in developing new extropy in an orderly progressive manner.

The term was first coined to serve as an antonym of entropy, replacing its prefix (representing the prepositional prefix ἐν en, “in” in its Ancient Greek etymon ἐντροπία entropía “a turning towards”) with ex- (representing the Ancient Greek ἐξ ex “out of”, “from”); although, because ἐξ eks takes the form ἐκ ek when prefixed to an element beginning with τ (t), the analogical spelling is ectropy (or ektropy), as if from Ancient Greek *ἐκτροπία (ektropía “a turning out of”).

See also[edit]


  • The Quest for a Unified Theory of Information: Proceedings of the Second International Conference on the Foundations of Information Science , Editor Wolfgang Hofkirchner. Psychology Press, 1999. PAge 272 [1]
  • Ellis, Ralph D. Curious Emotions: Roots of Consciousness and Personality in Motivated Action , ohn Benjamins Publishing, 2005, Page 92 [2]


  1. ^ The Principles of Extropy: A Quarter Century Later by Lifeboat Foundation Advisory Board member José Luis Cordeiro
  2. ^ Extropy, an essay by Kevin Kelly at Technium. August 29, 2009. Accessed December 2014
  3. ^ Teorn, Kai. "On extropy, complexity, and Harrison’s Law". Into the Everday. Retrieved 27 April 2015.