Archaic noun meaning dismissal or discharge from a position or duty. In modern Japanese, this meaning is usually expressed by words like 免職 (めんしょく) or 解雇 (かいこ).
In old documents, 免 can mean dismissal from an official post.
sorry; excuse me; pardon me · may I come in?; hello? · permission; leave; license · dismissal; discharge; being relieved of duty · not wanting; objecting to; being fed up with; wishing to avoid
license; permit; certificate · license; grant permission; permit
immunity; immunization · being hardened; being unaffected; being accustomed
exemption; exoneration; discharge
exemption from responsibility; disclaimer; release from liability
tax exemption; duty exemption
dismissal; discharge; removal from office
dismissal; discharge; removal from office
release from custody; discharge; acquittal
acquittal; exoneration · indulgence; remission of sins; pardon
reduction or exemption; mitigation or remission
dismiss from a position; remove from office · exempt; excuse; forgive
pardon; amnesty; remission
license; certificate; permit · diploma
temporary license; provisional license
appointment and dismissal
license suspension; driving license suspension
discharged prisoner; ex-convict
dismissal from office; discharge
exemption from service; release from duty
tax exemption
acquittal; dismissal of a case
seismic base isolation; base isolation
dismissal; removal from office
The kanji 免 originally conveys the idea of 'escape' or 'exemption'. The archaic noun usage for dismissal likely derives from the sense of being released from duty. The exact historical derivation is uncertain.