opportune (adj.)youdaoicibaDictYouDict[opportune 词源字典]
c. 1400, from Old French opportun and directly from Latin opportunus "fit, convenient, suitable, favorable," from the phrase ob portum veniens "coming toward a port," in reference to the wind, from ob "to, toward" (see ob-) + portus "harbor" (see port (n.1)). Related: Opportunely.[opportune etymology, opportune origin, 英语词源]