This is what I found in wiki
Standard textbook definitions
Note that textbook definitions are not always the most helpful
definitions, but they are an important aspect of the culture
surrounding the concept of entropy.
* Entropy energy broken down in irretrievable heat.[16]
* Boltzmann's constant times the logarithm of a multiplicity; where
the multiplicity of a macrostate is the number of microstates that
correspond to the macrostate.[17]
* the number of ways of arranging things in a system (times the
Boltzmann's constant).[18]
* a non-conserved thermodynamic state function, measured in terms
of the number of microstates a system can assume, which corresponds
to a degradation in usable energy.[19]
* a direct measure of the randomness of a system.[20]
* a measure of energy dispersal at a specific
temperature.[21]
* a measure of the partial loss of the ability of a system to
perform work due to the effects of irreversibility.[22]
* an index of the tendency of a system towards spontaneous
change.[23]
* a measure of the unavailability of a systems energy to do work;
also a measure of disorder; the higher the entropy the greater the
disorder.[24]
* a parameter representing the state of disorder of a system at the
atomic, ionic, or molecular level.[25]
* a measure of disorder
in the universe or of the availability of the energy in a
system to do work.[26]
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