An association of nations to promote free trade within the union and set common tariffs for nations that are not members.

Roget 769: compact, contract, agreement, bargain; affidation^†; pact, paction^†; bond, covenant, indenture; bundobast^†, deal.    stipulation, settlement, convention; compromise, cartel.    Protocol, treaty, concordat, Zollverein [G.], Sonderbund [G.], charter, Magna Charta [Lat.], Progmatic Sanction, customs union, free trade region; General Agreement on Tariffs and Trade, GATT; most favored nation status.    negotiation etc. (bargaining) 794; diplomacy etc. (mediation) 724; negotiator etc. (agent) 758.    ratification, completion, signature, seal, sigil [Lat.], signet.    ... show more

Dutch: douane-unie, tolunie
Polish: unia celna