different between expungement vs dismissal

English

expunge +? -ment

expungement (countable and uncountable, plural expungements)

The act of expunging.
(US, Canada) The process by which the record of a criminal conviction is erased, destroyed or sealed.

From dismiss +? -al. A nineteenth-century coinage (modelled on committal etc.), replacing the regular form dismission.

dismissal (countable and uncountable, plural dismissals)

The act of sending someone away.
Deprivation of office; the fact or process of being fired from employment or stripped of rank.
A written or spoken statement of such an act.
Release from confinement; liberation.
Removal from consideration; putting something out of one's mind, mentally disregarding something or someone.
(law) The rejection of a legal proceeding, or a claim or charge made therein.
(cricket) The event of a batsman getting out; a wicket.
(Christianity) The final blessing said by a priest or minister at the end of a religious service

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