from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The quality or state of being one; singleness or wholeness.
  • noun Singularity; uniqueness.
  • noun A state or condition of perfect harmony or accord.
  • noun Sameness of character.
  • noun Unison; agreement.

from The Century Dictionary.

  • noun The quality of being just one, and neither more nor less than one; unity; union.
  • noun Sameness; uniformity; identity.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The state of being one; singleness in number; individuality; unity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun uncountable State of being one or undivided; unity.
  • noun countable The product of being one or undivided.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quality of being united into one


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English *onnes, from Old English ānnes ("oneness, unity, agreement, covenant, solitude"), equivalent to one +‎ -ness.


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