threeness

The state of being three; triunity; trinity.

the Cappadocian Fathers provided a way of speaking about the Trinity which would create a balance between threeness and oneness.

[...] This statement focuses more on God's oness than on his threeness.

A group of three; a trio.

The Trinity.

Therefore concern yourselves, you philosophers: how God has created this world in six days. For the work of each day is a creation of a spirit in the Holy Threeness, and the seventh day is the rest of the Sabbath of God, in the seventh [...]

In Christian belief, the three persons (personae) of the Godhead: Father, Son and Holy Spirit; Trinity.

[...] and I might not look at the brightness of His face save through a sheen mirror between me and Him that shields my eyes. So I have often seen the Holy Threeness, Father and Son and Holy Ghost, three in one, and but a little while might I bear the light.

I'm not sure why God needs three forms — Father, Son, Holy Spirit. I don't know why we just can't say God. ... Jon went on for a while talking about the Trinity, the "Threeness and Oneness." It didn't sound as if he was convinced, though.