alliance (n.)youdaoicibaDictYouDict[alliance 词源字典]
c. 1300, "bond of marriage" (between ruling houses or noble families), from Old French aliance (12c., Modern French alliance) "alliance, bond; marriage, union," from aliier (Modern French allier) "combine, unite" (see ally (v.)). As a bond or treaty between rulers, late 14c.[alliance etymology, alliance origin, 英语词源]