A public proclamation or edict; a summons by public proclamation. Chiefly, in early use, a summons to arms.
The gathering of the (French) king's vassals for war; the whole body of vassals so assembled, or liable to be summoned; originally, the same as arrière-ban: in the 16th c., French usage created a distinction between ban and arrière-ban, for which see the latter word.
From Middle English bannen ("to summon; to banish; to curse"), partly from Old English bannan ("to summon, command, proclaim, call out") and partly from Old Norse banna ("to prohibit; to curse"), both from Proto-Germanic *bannaną ("to proclaim, to order; to summon; to ban; to curse, forbid"), from Proto-Indo-European, innovative nasal-infixed zero-grade athematic present of *bʰeh₂-.
Cognate with Dutch bannen ("to ban, exile, discard"), German bannen ("to exile, to exorcise, captivate, excommunicate"), Swedish banna ("to ban, scold"), , Armenian բան and perhaps Albanian banoj ("to reside, dwell"). See also banal, abandon.
Borrowed from Romanian ban of uncertain origin, perhaps from Serbo-Croatian ban.