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Wiktionary

1. n. Separates items in a list.
2. n. Separates clauses in a sentence.
3. n. Separates coordinate adjectives.
4. n. Sets off quoted material that is the grammatical object of an active verb of speaking or writing.
5. n. Separates the year in a date.
6. n. Separates a region from a geographic place within.
7. n. Separates the surname from given name when the traditional order is the reverse.
8. n. Separates title from a name.
9. n. Marks elision.
10. n. Marks a noun or pronoun used independently when speaking to some person, place or thing.
11. n. The thousands separator used in some countries.
12. n. The decimal separator used in some countries.