Definition of reductio ad impossibile in English:

reductio ad impossibile

(also reductia ad impossibile)

noun

Logic
  • Reductio ad absurdum.

Origin

Mid 16th century; earliest use found in Thomas Wilson (d. 1581), humanist and administrator. From post-classical Latin reductio ad impossibile from classical Latin reductiō + ad to + impossibile the impossible, use as noun of neuter of impossibilis, after ancient Greek ἡ εἰς τὸ ἀδύνατον ἀπαγωγή (Aristotle Analytica Priora 29b5).

Pronunciation

reductio ad impossibile

/rɪˌdʌktɪəʊ ad ɪmpɒˈsiːbɪleɪ/