Noun
1. second
2. sec, time unit, unit of time, sulfur
3. S, sulphur, atomic number 16, chemical element, element, south
4. due south, S, cardinal compass point, mho
5. siemens, reciprocal ohm, S, conductance unit, S
6. letter, letter of the alphabet, alphabetic character, randomness
6. entropy, S, physical property