Definitions:

1. Abbreviation for 'Small' used to show the size of a piece of clothing. ABBREVIATION
   • She wore size 'S' in shirts.
2. Abbreviation for 'South' or 'Southern'. ABBREVIATION
3. An ending making nouns a plural. NOUN
4. Symbol for the chemical element 'Sulfur'. NOUN
5. The 19th letter of the English alphabet, a consonant. NOUN
   • 'S' comes after R.

Synonyms:

• second
• small
• south
• southern
• sulfur