#1 S n. [second, sec, s] 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites. wn
#2 S n. [sulfur, 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). wn
#3 S n. [south, due south, southward] the cardinal compass point that is at 180 degrees. wn
#4 S n. [mho, siemens, reciprocal ohm] a unit of conductance equal to the reciprocal of an ohm. wn
#5 S n. [s] the 19th letter of the Roman alphabet. wn
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