さいならさいならMeanings1interjectiongoodbye; farewell; so longcolloquialColloquial contraction of さようなら, used in casual, friendly goodbyes. Often associated with Kansai dialect, but understood nationwide.See also: さようなら「さいなら、また明日あした！」と友とも達だちに手てを振ふった。"Bye, see you tomorrow!" I waved to my friend.
