(chiefly religion, Christianity) Both trine and one at the same time.
Christians believe in a triune God, meaning that he is three hypostases in perfect unity.
1990, Mary Ann Fatula, The Triune God of Christian Faith, Liturgical Press (Michael Glazier Books), page 21,
To be Christian today thus means reflective and critical fidelity to the essential elements of our Christian heritage in scripture and tradition, yet in a way that enables us to respond to the ever new presence of the triune God active in our own experience and world.
2003, Jeffrey C. Pugh, Entertaining the Triune Mystery, Continuum International Publishing Group (Trinity Press International), page 80,
Because the triune God is seen in ways that reflect relationality, God's presence can be expressed in the world in such a way that gnostic separation of the world and God should not be allowed to be a central part of Christian belief.
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