Source : Webster's Revised Unabridged Dictionary (1913)

Cafeteria \Caf`e*te"ri*a\, n. [Cf. F. cafeti[`e]re.]
   A restaurant or caf['e] at which the patrons serve themselves
   with food kept at a counter, taking the food to small tables
   to eat. [U. S.]

Source : WordNet®

cafeteria
     n : a restaurant where you serve yourself and pay a cashier