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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