<p><strong>Noun</strong></p><ul><li>In thermodynamics, a function of thermodynamic variables, such as temperature, pressure, or composition, differing from energy in that energy is the ability to do work, and entropy is a measure of how much energy is not available.</li><li>The less work that is produced, the greater the entropy, so when a closed system is void of energy, the result is maximum entropy.</li><li>In statistical mechanics, a measure of the randomness of the microscopic constituents of a thermodynamic system.</li><li>S (in data transmission and information theory), a measure of the loss of information in a transmitted signal or message.</li><li>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).</li><li>A state of disorder, or a tendency toward such a state; chaos.</li><li>A doctrine of inevitable social decline and degeneration.</li></ul>