The story
From Greek μόνος (only one) + Greek πατήρ (father), 'of the father only' or 'from the father only'.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: In Christian theology, teachings that hold the Father as a singular source of a particular relation, for example: notion that the Holy Spirit proceeds from the Father only, as from the singular source of eternal procession. Full definition →
From Greek μόνος (only one) + Greek πατήρ (father), 'of the father only' or 'from the father only'.
Etymology from Wiktionary, CC BY-SA 4.0.