Wiktionary
twoness
n. The state or condition of being two; duality; doubleness.
Usage examples of "twoness".
The transformation from 6 to 2 will be so imperceptible that you will never, I think, be able to detect a single bend in the road, but by the time you have arrived at your final destination, at complete Twoness, you would not be able to recognize yourself in what you have become, anymore than that new self, that perfect figure 2, will be able to see himself in you, the ‘you’ who hears this.
Terry and I had always felt like interruptions in their twoness, so we were glad we had each other.