In hmolscience, entropy antonyms are terms conceived as being opposite to that of entropy, particularly in the Boltzmann-Planck sense of entropy as a measure of system disorder. Entropy antonyms come in a variety of terms, all conceived by different people (each with their own following), that all have the same general meaning, generally conceptualized as that of an ordering parameter; the majority of which being classified as a type of ontic opening:


Term
Definition
Originator





Sorting demon
(1867)
A hypothetical intelligence able to sort random disordered gas molecules into two groups: fast and slow, and therein reverse the second law, and effect a decrease in entropy; not specifically an antonym, but in the same general category.James Maxwell (1831-1879)
Scottish mathematical physicist
1.Ektropy
(1900)
The energetics related to morphic order or generating order or form in ordinary space.Georg Hirth (1841-1916)
German writer
2.Ectropy
(1910)
A hypothetical organizing force of life.Felix Auerbach (1856-1933)
German physicist
3.Syntropy | Syntropic
(1941)
A "negative entropy" synonym; a force which causes living things to reach "higher and higher levels of organization, order and dynamic harmony." Luigi Fantappie (1901-1956)
Albert Szent-Györgyi (1974)
4.Negative entropy
(1943)
States that life is anything that "feeds" on this; not specifically an "antonym" per se.Erwin Schrodinger (1887-1961)
Austrian physicist
5. Disentropic
(1947)
The “happenings which turn against the trend towards increasing entropy”. Alfred Ubbelohde (1907-1988)
Belgian thermodynamicist
6. Negentropy
(1950)
A contraction of Schrodinger's "negative entropy" principle of life argument.Leon Brillouin (1889-1969)
French-born American physicist
7.Anti-entropy
(1951)
An "effect of changes that are seized, draws a portion of matter in the direction of continually higher forms of structurization and centration."Pierre Teilhard (1881-1955)
French science religion philosopher
8.Extropy
(1967)
A counter-entropy quantity, involving truth and beauty and goodness, would be expected to lead inevitably to god. Harry Overstreet (1875-1970)
American philosopher
Tom Bell (1988)
9.Ordiny
(1975)
Defined as the opposite of entropy (disorder), i.e. "ordiny (order)", like negentropy.Norman Dolloff (1907-1984)
American metallurgical engineer
10.Centropy
(c.1975)
A type of centration opposite to entropy (disgregation); where things come together; a pooling of human energies.Joseph Bois (1892-1978)
French priest-psychologist
Irving Simon (1980)
11.Exentropic
(1978)
A term meant to capture the logic that since living systems are "open" they evade the second law.Rupert Riedl | Austrian zoologist
(1925-2005)
12.Neguentropy
(1979)
Tendency towards order.Joel de Rosnay | French biochemist
(1937-)
13.Teleonomic entropy
(1982)
A teleological-conceptualized entropy; which the conceive as "related to, but not identical to, physicochemical entropy."Dimitri Katakis and Charis Katakis
14.Psychic negentropy
(1986)
A syncretism of psychic entropy (1928) + negentropy (1942), meaning “negative psychic entropy”, referring to mental states of positive emotions such as happiness, strength, or alertness.Mihály Csíkszentmihályi | Hungarian-born American psychologist
15.Orgatropy
(1992)

Gilbert Chauvet | French mathematical physicist
(1942-)
16.Antientropism
(2003)
The opposite of entropism is associated with the study of goodKeith Ferreira
(c.1970-)
17.Genopsych
(2007)
A hypothetical extensive psychological-thermodynamic property, operating counter to entropy, reasoned to give directionality to the process of evolution.
DMR Sekhar | Indian chemical engineer
(1952-)

Others include: Entropy reduction, Entropy reversal, Inverse entropy, Local entropy decrease, Entropy islands, and Low entropy. Each are a verbal way to argue out of the Planck-Boltzmann view of the second law as "systems tend towards disorder", such as is captured in the principle of elementary disorder, so as to explain topics such as evolution, the ordering effect of humanity, purpose, etc.

Confusion | Discussion
The general confusion, in respect to the proliferation of entropy antonyms coinings, as listed above, has to do with firstly a misreading of the specifics of the meaning of the second law, which is NOT that the disorder of the universe (or given system) will tend to a maximum, but correctly that the “equivalence value N of all uncompensated transformations”, aka entropy, in a given cycle integral number of heat cycles, of a given process, will tend to a maximum numerical value in magnitude |N]; which in the case of an “isolated system” (condition: quantities of extensity constant), the thermodynamic potential will be entropy (negative), according to which, at equilibrium, the following two conditions will accrue: dS = 0 and S = maximum; but for human social systems, where temperature and pressure are constant, the thermodynamic potential is Gibbs energy (negative), and at equilibrium, the following two conditions will accrue: dG = 0 and G = min, according to which measurements of order and disorder of structures are quantified on free energy tables, i.e. a given human or social system or order in a given state of existence will have a given free energy of formation, and moreover that transformations into the future, state to state, do not accrue towards greater states of disorder, but rather that the sum state-to-state transformations accrue in the direction that will show a decrease in the thermodynamic potential, i.e. the accrue in the direction of the condition: dG < 0, i.e. actuate along reaction coordinate of a free energy decrease, and will involved coupling.

This is similar to the laws behind a rock falling off a cliff. The rock will go in the direction that shows a decrease in the gravitational potential, i.e. toward the earth; and the process will not accrue towards a greater increase in disorder, but rather accrue in the direction of the given potential. The above dozen+ entropy antonyms proliferations, in short, are the result of a general ignorance among scientists about chemical thermodynamics, the nature of the free energy of formation of structures, in particular.

Aluminum chloride | Aluminum oxide

See also: Human free energy table; Human free energy of formation
To go through one example, supposed we put aluminum Al in contact with firstly chlorine Cl in one reaction system, and then in a separate chlorine in contact with oxygen O, and then see whether the rule "nature tends towards" disorder will prevail as the governing paradigm:

SpeciesImagePhaseFormulaEntropy
Sf° J/(mol K)
Formation Free Energy
ΔGf° (kJ/mol)

Aluminum chloridealuminum chlorideSolidAlCl3109.29 -628.9
Aluminum oxideAluminum oxideSolidAl2O350.92-1582.3

Here, just by looking at the resulting products, aluminum chloride AlCl3 (top) and aluminum oxide Al2O3 (bottom) it is not simple a matter to point one's finger and say "ha, disorder has prevailed!", because the top pile of granules seems to be more "ordered" than the bottom chunky looking metal, and it has a higher entropy (109.29) value. Correctly, we look at the formation free energy, which in this example is greater in (negative) magnitude for the formation of aluminum oxide (1582.3) than for the aluminum chloride (628.9), therefore nature will favor the formation of the aluminum oxide over that of aluminum chloride, given the two alternative reaction directions, and this is the way it is throughout the natural world seen around us, i.e. this is how "nature selects" between different "species" as Darwin would say, NOT "survival of the fittest" but "selection of the most exergonic".

Quotes
The following are related quotes:

“It has sometimes been maintained that the second law of thermodynamics does not hold in living nature. Remember the sorting demon, invented by Maxwell, and Auerbach’s doctrine of ectropy, stating that life is an organization created to avert the menacing entropy-death of the universe. Ectropy does not exist. However, thermodynamics was concerned only with closed systems, and its extension to open systems leads to very unexpected results.”
Ludwig Bertalanffy (1950), “The Theory of Open Systems in Physics and Biology” [1]

“Many biologists have taken to speaking in terms of the entropy of an organism, or about its antonymnegentropy’, as a measure of the structural order within an organism.”
Robert Ulanowicz (1986), Growth and Development [2]

See also
‚óŹ Entropy (portmanteaus)

References
1. Bertalanffy, Ludwig. (1950). “The Theory of Open Systems in Physics and Biology” (pdf) (pg. 25-26), Science, 111:23-29.
2. Ulanowicz, Robert E. (1986). Growth and Development: Ecosystems Phenomenology (pg. 21). Springer, 2012.

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