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supererogation

su·per·er·o·ga·tion [ spər erə gáysh'n ]


noun 
Definition:
 
performance beyond call of duty: the performance of work beyond what is required or expected

[Early 16th century. < late Latin supererogation-< supererogare "pay over and above" < Latin super "over, above" + erogare "spend" < rogare "ask, beg"]
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