From WordNet (r) 2.0 (August 2003) [wn]:
folk
n 1: people in general; "they're just country folk"; "the common
people determine the group character and preserve its
customs from one generation to the next" [syn: {common
people}]
2: a social division of (usually preliterate) people [syn:
tribe]
3: people descended from a common ancestor; "his family has
lived in Massachusetts since the Mayflower" [syn:
family, family line, kinfolk, kinsfolk, sept,
phratry]
4: the traditional and typically anonymous music that is an
expression of the life of people in a community [syn:
folk music, ethnic music]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Folk \Folk\ (f[=o]k), Folks \Folks\ (f[=o]ks), n. collect. & pl.
[AS. folc; akin to D. volk, OS. & OHG. folk, G. volk, Icel.
f[=o]lk, Sw. & Dan. folk, Lith. pulkas crowd, and perh. to E.
follow.]
1. (Eng. Hist.) In Anglo-Saxon times, the people of a group
of townships or villages; a community; a tribe. [Obs.]
[1913 Webster]
The organization of each folk, as such, sprang
mainly from war. --J. R. Green.
[1913 Webster]
2. People in general, or a separate class of people; --
generally used in the plural form, and often with a
qualifying adjective; as, the old folks; poor folks.
[Colloq.]
[1913 Webster]
In winter's tedious nights, sit by the fire
With good old folks, and let them tell thee tales.
--Shak.
[1913 Webster]
3. The persons of one's own family; as, our folks are all
well. [Colloq. New Eng.] --Bartlett.
[1913 Webster]
Folk song, one of a class of songs long popular with the
common people.
Folk speech, the speech of the common people, as
distinguished from that of the educated class.
[1913 Webster]