ultima ratio

noun
ul·ti·ma ra·tio | \ˌu̇l-tə-mə-ˈrä-tē-ˌō \

Definition of ultima ratio 

: the final argument also : the last resort (such as force)

First Known Use of ultima ratio

1780, in the meaning defined above

History and Etymology for ultima ratio

New Latin

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The first known use of ultima ratio was in 1780

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