noun, noun or participle which takes 'suru'
Formal, literary, and euphemistic term for death. Often used in obituaries, condolences, or solemn writing. The する form means 'to pass away'.
彼の永逝を悼み、謹んでお悔やみ申し上げます。
I mourn his passing and offer my deepest condolences.
祖父が永逝してから、もう三年になる。
It has been three years since my grandfather passed away.