league (n.1)youdaoicibaDictYouDict[league 词源字典]
"alliance," mid-15c., ligg, from Middle French ligue "confederacy, league" (15c.), from Italian lega, from legare "to tie, to bind," from Latin ligare "to bind" (see ligament). Originally among nations, subsequently extended to political associations (1846) and sports associations (1879). League of Nations first attested 1917 (created 1919).[league etymology, league origin, 英语词源]
league (n.2)youdaoicibaDictYouDict
distance of about three miles, late 14c., ultimately from Late Latin leuga (source also of French lieue, Spanish legua, Italian lega), said by Roman writers to be from Gaulish. A vague measure (perhaps originally an hour's hike) never in official use in England, where it is recorded more often in poetic than in practical writing.
league (v.)youdaoicibaDictYouDict
"to form a league," 1610s, from league (n.1). Related: Leagued; leaguing.