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from Wiktionary, Creative Commons Attribution/Share-Alike License.

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