reductio

noun
re·duc·tio | \ rə̇ˈdəkshēˌō , rēˈ- ; rāˈdu̇ktēˌō \
plural reductiones\⸗ˌ⸗⸗ˈōˌnēz; ⸗ˌ⸗⸗ˈōˌnās \

Definition of reductio 

: an act or process of reducing used as the first term in phrases relating to disproof of a proposition by arguing it to an obviously false conclusion reductio ad impossible — compare ad absurdum

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History and Etymology for reductio

Late Latin

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occurring twice a year or every two years

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