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rigorous (adj.)
[rigorous 词源字典]
late 14c., from Old French
rigorous
(13c., Modern French
rigoureux
), from Medieval Latin
rigorosus
, from Latin
rigor
(see
rigor
). Related:
Rigorously
.
[rigorous etymology, rigorous origin, 英语词源]
[rigorous 词源字典]