Definition of per impossibile in US English:

per impossibile

adverb

Logic
  • As is impossible.

Origin

Mid 19th century; earliest use found in Augustus De Morgan (1806–1871), mathematician and historian. From classical Latin per impossibile by impossibility (probably 2nd cent. a.d.: see note) from per + impossibile, use as noun of neuter of impossibilis.

Pronunciation

per impossibile

/ˌpəːr ɪmpɒˈsɪbɪleɪ/