- (in statistical mechanics) a measure of the randomness of the microscopic constituents of a thermodynamic system. Symbol: S.
- (on a macroscopic scale) a function of thermodynamic variables, as temperature, pressure, or composition, that is a measure of the energy that is not available for work during a thermodynamic process. A closed system evolves toward a state of maximum entropy.
- (in data transmission and information theory) a measure of the loss of information in a transmitted signal or message.
- (in cosmology) a hypothetical tendency for the universe to attain a state of maximum homogeneity in which all matter is at a uniform temperature (heat death)
a doctrine of inevitable social decline and degeneration.
Charles Darwin's Theory of Evolution once was considered shocking. To suggest that humankind descended from apes was considered blasphemous. Oddly we now have arrived at a state of entropy occupied at one extreme by proponents of "unnatural selection" who argue in favor of artificial, planned, engineered evolution, thereby rendering criticisms of Darwin quaint; and on the other extreme by neo-fundamentalist religious zealots who would like to reanimate the Darwin debate and realists who have accepted the malaise of a lingering entropy as the inescapable path forward. In Future Humans: Four Ways We May or May Not Evolve, The National Geographic has provided a blueprint for the future with four paths to choose from: Where do we go from here?
(Reference: FUTURE HUMANS: Four Ways We May, or May Not, Evolve. (2009, November 24). Retrieved April 1, 2015, from http://news.nationalgeographic.com/news/2009/11/091124-origin-of-species-150-darwin-human-evolution.html.)