oneness

From Middle English onnesse, annesse, from Old English ānnes (“oneness, unity, agreement, covenant, solitude”), equivalent to one +‎ -ness.

oneness (countable and uncountable, plural onenesses)

1. (uncountable) State of being one or undivided; unity.
   • 2013 June 7, David Simpson, “Fantasy of navigation”, in The Guardian Weekly, volume 188, number 26, page 36:

     It is tempting to speculate about the incentives or compulsions that might explain why anyone would take to the skies in [the] basket [of a balloon]: […]; perhaps to moralise on the oneness or fragility of the planet, or to see humanity for the small and circumscribed thing that it is; […].

2. (countable) The product of being one or undivided.

• one
• only

• onehood
• twoness
• threeness
• manyness
• undivided
• unity

• Essonne, Senones, senones