What Is Oneness?

Wikipedia has a brilliant overview:
https://en.wikipedia.org/wiki/Nondualism

Ultimate, oneness is not two parts.
Oneness is pure awareness.

Pure awareness is not aware of other – or itself.
Pure empty awareness is nondualism.

Whatever we then call this is just words and concepts: clarity, pure awareness, consciousness, God, God consciousness, Brahman, light, love, luminosity, bliss,
harmony, union …

Clinging to names is diversity = to turn aside, to divert attention.
We are oneness, but we don’t all realise this at the same time! 🙂