n.1.  The quality or state of being one; singleness or wholeness.
2.  Singularity; uniqueness.
3.  A state or condition of perfect harmony or accord: "He intuited global truths. He thrilled at his oneness with humanity" (Sally Jacobs).
4.  Sameness of character: the disagreeable oneness of roadside landscapes.
5.  Unison; agreement: oneness of mind and purpose.