Mediation
The Reformers, and after them the Protestant scholastics, argue that neither nature (divine or human) by itself could mediate between God and man and that both natures together perform the one opus theandricum (q.v.), or divine-human work; therefore, Christ is Mediator according to both natures.
Richard Muller, Dictionary of Latin and Greek Theological Terms : Drawn Principally from Protestant Scholastic Theology, Second Edition (Grand Rapids, MI: Baker Academic, 2017), 315