S
Part of speech: noun
Definition: The nineteenth letter of the English alphabet. The nineteenth in a list. (Synonyms: 19, XIX)
Part of speech: abbreviation
Definition: abbreviation for the scruple (the apothecaries' system unit of mass)
Part of speech: symbol
Definition: A symbol of the International Phonetic Alphabet (IPA), representing a voiceless alveolar fricative.
Entropy
Part of speech: noun
Definition: Strictly thermodynamic entropy. A measure of the amount of energy in a physical system that cannot be used to do work.# strictly thermodynamic entropy. A measure of the amount of energy in a physical system which cannot be used to do mechanical work.# A measure of the disorder present in a system.# The capacity factor for thermal energy that is hidden with respect to temperature [http://arxiv.org/pdf/physics/0004055].# The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature. [http://www.entropysite.com/students_approach.html]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.