s meaning and definition

S noun

Definition of s (noun)

1. 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
   • synonyms: sec, second
2. 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)
   • synonyms: atomic number 16, sulfur, sulphur
3. the cardinal compass point that is at 180 degrees
   • synonyms: due south, south, southward
4. a unit of conductance equal to the reciprocal of an ohm
   • synonyms: mho, reciprocal ohm, siemens
5. the 19th letter of the Roman alphabet
6. the 19th letter of the Roman alphabet
7. (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"
   • synonyms: entropy, randomness