What does sont mean in french?

'sont' is the Third Person Plural (are). The Third Person Singular = 'est' (is).

The Word 'sont' is the third person singular form of the verb. It's in the present indicative tense. Its meaning is [they] are.
sont is the third person form of the verb etre. etre means "to be" so sont would be "they are". either "ils" or "elles" must precede it in a sentence.