英和和英

語源

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”)).

発音

• IPA^(key): /ˈɛntɹəpi/

名詞

entropy (countable かつ uncountable, 複数形 entropies)

1. A measure of the disorder present in a system.
   1. (Boltzmann definition) A measure of the disorder directly proportional to the natural logarithm of the number of microstates yielding an equivalent thermodynamic macrostate.
   2. (information theory) Shannon entropy
2. (thermodynamics, countable) A measure of the amount of energy in a physical system that cannot be used to do work.
3. The capacity factor for thermal energy that is hidden with respect to temperature.^[1]
4. The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature.^[2]
5. (statistics, information theory, countable) A measure of the amount of information and noise present in a signal.
6. (uncountable) The tendency of a system that is left to itself to descend into chaos.

同意語

• anergy
• bound entropy
• disgregation

反意語

• aggregation
• exergy
• free entropy
• negentropy

派生語

参考

• chaos

参照

Further reading

• entropy in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• entropy in The Century Dictionary, New York, N.Y.: The Century Co., 1911
• entropy at OneLook Dictionary Search

アナグラム

• Poynter, peryton