Definition of ad extra in English:

With effect or result in the outside world (as opposed to one's own mind, self, etc.); in the world at large; externally, perceivably; especially (Theology) with reference to an action or characteristic of God which is communicable to the world beyond the Persons of the Trinity. Opposed to ad intra.

Designating an action that has an effect or result in the outside world; exteriorized, perceivable, external; (Theology) designating or relating to an action or characteristic of God which is communicable beyond the Persons of the Trinity. Opposed to ad intra.