SINCE 1828
modus tollens
noun
modus tol·lens
| \-ˈtäˌlenz\
plural modi tollentes\-(ˌ)täˈlen‧ˌtēz
\
Definition of modus tollens
: a mode of reasoning from a hypothetical proposition according to which if the consequent be denied the antecedent is denied (as, if A is true, B is true; but B is false; therefore A is false)
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