The state or quality of being confirmed; established or settled certainty.
From 'confirm' plus the suffix '-ity' (expressing a state or quality). This is a less common variant related to 'confirmation,' formed by attaching '-ity' directly to the verb stem rather than using 'confirmation.'
Words ending in '-ity' are abstract nouns describing qualities, and 'confirmity' is so rare that many modern dictionaries don't include it—it's a word that existed grammatically but never became practical enough for widespread adoption.
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