s (Noun) — The cardinal compass point that is at 180 degrees.
s (Noun) — The 19th letter of the Roman alphabet.
s (Noun) — (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work. ex. "S increases as matter and energy in the universe degrade to an ultimate state of inert uniformity"
s (Noun) — An abundant tasteless odourless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions).
s (Noun) — A unit of conductance equal to the reciprocal of an ohm.
s (Noun) — 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites.