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Webster 1913 Edition

Adj.

Of or pertaining to an agent or an agency.

Fitzed. Hall.

agential ‎(comparative more agential, superlative most agential)

Of or pertaining to an agent or an agency.
- 2012 January 1, Stephen Ledoux, “Behaviorism at 100”, in American Scientist, volume 100, number 1, page 60:
  Becoming more aware of the progress that scientists have made on behavioral fronts can reduce the risk that other natural scientists will resort to mystical agential accounts when they exceed the limits of their own disciplinary training.

pertaining to an agent or an agency