The noun folk has 4 senses (first 3 from tagged texts)
1. (14) folk, folks, common people -- (people in general (often used in the plural); "they're just country folk"; "folks around here drink moonshine"; "the common people determine the group character and preserve its customs from one generation to the next")
2. (1) tribe, folk -- (a social division of (usually preliterate) people)
3. (1) family, family line, folk, kinfolk, kinsfolk, sept, phratry -- (people descended from a common ancestor; "his family has lived in Massachusetts since the Mayflower")
4. folk music, ethnic music, folk -- (the traditional and typically anonymous music that is an expression of the life of people in a community)