Etymology
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sanguinity (n.)

late 15c., "consanguinity, blood-relation," a sense now obsolete; see sanguine + -ity. Meaning "quality or character of being sanguine" is by 1737. 

updated on December 10, 2021

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Definitions of sanguinity from WordNet

sanguinity (n.)
feeling sanguine; optimistically cheerful and confident;
Synonyms: sanguineness
From wordnet.princeton.edu, not affiliated with etymonline.