1. To revoke the certification of.
2. To remove the official status of (a labor union) by withdrawing the right to act as a collective-bargaining agent. [Cases: Labor Relations 216. C.J.S. Labor Relations §§ 191–192, 210.]
3. (Of a court) to overrule a previous order that created a class for purposes of a class action; to officially undo (a class). [Cases: Federal Civil Procedure 173; Parties 35.49. C.J.S. Parties § 36.] Cf. CERTIFY. — decertification, n.
