1. (noun)second, sec, s 1/60 of a minute; the basicunit of time adopted under the Systeme International d'Unites
2. (noun)sulfur, S, sulphur, atomic number 16 an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in nativeform (especially in volcanic regions)
3. (noun)south, due south, southward, S the cardinalcompasspoint that is at 180 degrees
6. (noun)randomness, entropy, S (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work "entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity"
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