Source : Webster's Revised Unabridged Dictionary (1913)

Clientele \Cli`en*tele"\ (? or ?), n. [L. clientela: cf. F.
   client[`e]le.]
   1. The condition or position of a client; clientship. [Obs.]
      --Bp. Hall.

   2. The clients or dependents of a nobleman of patron.

   3. The persons who make habitual use of the services of
      another person; one's clients, collectively; as, the
      clientele of a lawyer, doctor, notary, etc.

Source : WordNet®

clientele
     n : customers collectively; "they have an upper class clientele"
         [syn: {patronage}, {business}]