1. (noun) second, sec, s
1/60 of a minute; the basic unit 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 native form (especially in volcanic regions)
3. (noun) south, due south, southward, S
the cardinal compass point that is at 180 degrees
4. (noun) mho, siemens, reciprocal ohm, S
a unit of conductance equal to the reciprocal of an ohm
5. (noun) S, s
the 19th letter of the Roman alphabet
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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Definition of 'S' 
