entropy.
A measure of the disorder present in a system.
Meaning & usage
A measure of the disorder present in a system. A measure of the disorder directly proportional to the natural logarithm of the number of microstates yielding an equivalent thermodynamic macrostate.
A measure of the disorder present in a system. Shannon entropy
A measure of the amount of energy in a physical system that cannot be used to do work.
The capacity factor for thermal energy that is hidden with respect to temperature.
The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.
A measure of the amount of information and noise present in a signal.
The tendency of a system that is left to itself to descend into chaos.
Where this word comes from
First attested in 1867, as the translation of German Entropie, coined in 1865 by Rudolph Clausius in analogy to Energie (“energy”), replacing the root of Ancient Greek ἔργον (érgon, “work”) by Ancient Greek τροπή (tropḗ, “transformation”)).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.