ex opere operato

ex opere oper·​a·​to | \-ˈrät(ˌ)ō\

Definition of ex opere operato 

: in virtue of the action used of a sacrament considered independently of the merits of the minister or the recipient — compare ex opere operantis

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History and Etymology for ex opere operato

Medieval Latin, literally, from the work done

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obstinately defiant of authority

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