Etymology
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legitimacy (n.)

"state of being legitimate" in any sense, 1690s of children, 1812 of kings and governments, general use by 1836; see legitimate (adj.) + -cy. Legitimateness (1610s) is an earlier word for it. Middle English had legitimation (mid-15c.).

updated on June 10, 2016

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Definitions of legitimacy from WordNet

legitimacy (n.)
lawfulness by virtue of being authorized or in accordance with law;
legitimacy (n.)
undisputed credibility;
Synonyms: authenticity / genuineness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.