retirement at one's own request; dismissal upon request
Formal term used in civil service or corporate contexts when an official resigns voluntarily and is formally discharged.
He was granted retirement at his own request and left his long public service.
依願退職 is a more general term for voluntary resignation, while 依願免官 specifically refers to dismissal from an official post upon request.
Compound of 依願 (upon request) and 免官 (dismissal from office).