The term extropy was coined by Tom Bell (T.O. Morrow) and defined by Max More in January 1988 as "the extent of a living or organizational system's intelligence, functional order, vitality, energy, life, experience, and capacity and drive for improvement and growth." Extropy expresses a metaphor, rather than serving as a technical term, and so is not simply the opposite of entropy, although it is also considered the appropriate antonym.
In the philosophy of digital probabilistic physics, the extropy of a physical system is defined to be the self-information of the Markov chain probability of the physical system at a moment in time. This was to distinguish the probability of the Markov state of the physical system from the probability defined by entropy which creates ensembles of equivalent microstates.
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