noun, noun or participle which takes 'suru', intransitive verb
eternal sleep; passing away; death
Euphemistic term for death, often used in obituaries, condolences, or formal announcements. Can be used as a noun or with する to mean 'to pass away'.
彼は昨夜、永眠いたしました。
He passed away last night.
永眠の知らせを受けて、深い悲しみに包まれています。
We are deeply saddened by the news of his passing.