ex opere operantis

ex ope·re oper·an·tis | \ek¦sōpərēˌōpəˈräntə̇s\

Definition of ex opere operantis 

: in virtue of the agent used of a sacrament considered in relation to the conditions required for its valid administration or for its worthy reception — compare ex opere operato

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History and Etymology for ex opere operantis

Medieval Latin, literally, from the work of the worker

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