Oregon Revised Statutes Remedies and Special Actions and Proceedings § 34.105

(1) “Adverse party” means a beneficially interested party to a judicial or administrative proceeding from which a mandamus proceeding arises, whose interests are adverse to the relator.

(2) “Counsel for defendant” means the attorney who appears on behalf of the defendant in a mandamus proceeding as provided in ORS 34.130 (4).

(3) “Defendant” means the court, corporation, board, officer or person against whom relief is sought in a mandamus proceeding.

(4) “Relator” means the beneficially interested party on whose relation a mandamus proceeding is brought.