Definition of ad intra in English:

ad intra

adverb

Theology
  • With reference to an action or characteristic of God which is not communicable to the world beyond the Persons of the Trinity. Also more generally: with effect or result only in one's own mind, self, etc. (rather than in the outside world); within, internally. Opposed to ad extra.

adjective

Theology
  • Designating an action or characteristic of God that is not communicable beyond the Persons of the Trinity. Also more generally: designating an action that does not have an effect or result in the outside world; imperceptible, internal, interior. Opposed to ad extra.

Origin

Early 17th century; earliest use found in John Boys (d. 1625), dean of Canterbury. From post-classical Latin ad intra towards the inside from classical Latin ad to, towards + without object.

Pronunciation:

ad intra

/ˌad ˈɪntrə/