Etymology

modus tollendo tollens

Today it means: A valid form of argument in which the antecedent of a conditional proposition is infirmed, thereby entailing the infirmation of the consequent. Modus tollendo tollens has the form Full definition →

Latin modus
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The story

  1. Latin · borrowed frommodus
  2. English todaymodus tollendo tollens

Borrowed from Latin modus tollendō tollēns (roughly, “mode where infirming infirms”).

Words from the same roots

Latinmodus all →

modemoodmoldmodalmodusmodus ponendo ponensmodus ponendo tollensmodus tollendo ponenssubjunctive mood

Etymology from Wiktionary, CC BY-SA 4.0.