INTERCESSOR

intercessor|interceder. Intercessor, or Interceder, n. a mediator, an agent

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In′ter‐ces″sor (?), n. [[L., a surety: cf. F. intercesseur.]] 1. 1. One who goes between, or intercedes; a mediator. (a) One who interposes between parties at variance, with a view to reconcile them. (b) One who pleads in behalf of another. Milton.
2. 2. (Eccl.) A bishop, who, during a vacancy of the see, administers the bishopric till a successor is installed.