Origin: 1585–95; earlier bandetto, plural banditti < Italian banditi outlaws, plural of bandito proscribed, past participle of bandire banish, exile, announce publicly < Gothic bandwjan to make a sign, indicate (compare band1) with v. suffix -ire < Latin -īre
1590s, from It. bandito (pl. banditi) "outlaw," pp. of bandire "proscribe, banish," from V.L. *bannire "to proclaim, proscribe," from P.Gmc. *bann (see ban). *Bannire (or its Frankish cognate *bannjan) in O.Fr. became banir-, which, with lengthened stem, became English banish.