Cass

[F. casser, LL. cassare, fr. L. cassus empty, hollow, and perhaps influenced by L. quassare to shake, shatter, v. intens. of quatere to shake. Cf. Cashier, v. t., Quash, Cask.]
To render useless or void; to quash; to annul; to reject; to send away. [Obs.] Sir W. Raleigh.

Coding Accuracy Support System created by the U.S. Postal Service for mailers, service bureaus, and software vendors that improves the accuracy of delivery point, ZIP, and carrier route coding assignments on mailing lists. CASS evaluates the address-matching software used and diagnoses problems. See also cass certified.