さよなら - JP-EN Jisho

さよなら

common

interjection (kandoushi)

farewell; so long; goodbye

See also:

noun (common) (futsuumeishi)intransitive verbnoun or participle which takes the aux. verb suru

parting with; saying goodbye to (e.g. life as a bachelor); putting an end to

noun or verb acting prenominally

farewell (performance, party, etc.); final; last; game-winning (e.g. hit)