Etymology
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plethora (n.)

1540s, a medical word for "excess of body fluid, overfullness of blood," from Late Latin plethora, from Greek plēthōrē "fullness," from plēthein "be full" (from PIE root *pele- (1) "to fill"). Figurative meaning "too-muchness, overfullness" in any respect is recorded by 1700. Related: Plethoric.

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Definitions of plethora

plethora (n.)
extreme excess;
Synonyms: overplus / superfluity / embarrassment
From wordnet.princeton.edu