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raison d'etre (n.)
[raison d'etre 词源字典]
"excuse for being," 1864, first recorded in letter of J.S. Mill, from French
raison d'être
, literally "rational grounds for existence."
[raison d'etre etymology, raison d'etre origin, 英语词源]
[raison d'etre 词源字典]