noun, noun or participle which takes 'suru', intransitive verb
last farewell; final parting
A solemn, literary term for a final farewell, often used in the context of death or permanent separation. Can be used as a noun or with する to mean 'to bid a final farewell'.
友との永訣の時が来た。
The time has come for a final farewell to my friend.
彼は故郷に永訣した。
He bid a final farewell to his hometown.