[rahy-chuh s-nis]
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  1. the quality or state of being righteous.
  2. righteous conduct.
  3. the quality or state of being just or rightful: They came to realize the righteousness of her position on the matter.

Origin of righteousness

before 900; Middle English rightwisnes(se), Old English rihtwīsnes. See righteous, -ness
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for righteousness

Old English rehtwisnisse; see righteous + -ness.

Online Etymology Dictionary, © 2010 Douglas Harper