coagency

noun

1. (countable, uncountable)Agency in common, or a joint or combined agency.

   “If indeed by the force of Matthew's example, by persuasion or by additional and more mysterious influences, or by an inward co-agency, compatible with the existence of a personal will, James should be led to repent; if through admiration and love of this great goodness gradually assimilating his mind to the mind of his benefactor, he should in his own person become a grateful and dutiful child — then doubtless the mother would be wholly satisfied!”