floruit

[ floh-roo-it; English flawr-yoo-it, flohr-, flor- ]
/ ˈfloʊ ru ɪt; English ˈflɔr yu ɪt, ˈfloʊr-, ˈflɒr- /

noun Latin.

he (or she) flourished: used to indicate the period during which a person flourished, especially when the exact birth and death dates are unknown. Abbreviation: fl., flor.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for floruit

floruit
/ Latin (ˈflɒruːɪt) /

verb

(he or she) flourished: used to indicate the period when a historical figure, whose birth and death dates are unknown, was most activeAbbreviation: fl ., flor .
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012