1 : the cardinal compass point that is at 180 degrees
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)
3 : 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
4 : (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
5 : a unit of conductance equal to the reciprocal of an ohm
