adiaŭ

Adiaŭ is the heavy goodbye, the one that assumes you may not meet again, and it carries the weight accordingly. For ordinary partings Esperantists say ĝis la revido or simply ĝis, which is the everyday see you and by far the commoner word at a club or a congress. Use adiaŭ at a station platform in a novel, not when leaving the room for five minutes. Being Esperanto, the interjection takes endings freely: adiaŭi is to bid farewell to someone, and adiaŭo is the farewell itself. The final ŭ is a semivowel and forms a diphthong with the a before it, so the stress lands on the i: a-DI-aŭ.