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Webster 1913 Edition

Adj.

[L.

archidiaconus

, Gr. [GREEK], equiv. to E.

archdeacon

Of or pertaining to an archdeacon.

This offense is liable to be censured in an

archidiaconal

visitation.

Johnson.

Adj.

[See Deacon.]

Pertaining to an archdeacon; as an archidiaconal visitation.

archidiaconal ‎(not comparable)

(ecclesiastical) Pertaining to an archdeacon.
- 2015, GR Evans, Edward Hicks: Pacifist Bishop at War:
  Hicks wrote in the diary in July 1913 about the arrangements for the two forthcoming archidiaconal installations.

pertaining to an archdeacon