/ ˌderəˈgeɪʃn; NAmE / noun [ U , C ] ( formal )
1.
an occasion when a rule or law is allowed to be ignored
2.
words or actions which show that sb or sth is considered to have no worth
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WORD ORIGIN
late Middle English (in the sense impairment of the force of ): from Latin derogatio(n-) , from the verb derogare , from de- aside, away + rogare ask.