Dismissal

google

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late Middle English: from medieval Latin dismiss-, variant of Latin dimiss- ‘sent away’, from the verb dimittere .

wiktionary

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

etymonline

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dismissal (n.)

"act of dismissing; state or fact of being dismissed," by 1795, formed on model of refusal, etc., from dismiss + -al (2); replacing earlier dismission (1540s); dismissing (late 15c.).