One of the mysteries of the English language finally explained.
As is impossible.
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.
per impossibile/ˌpəːr ɪmpɒˈsɪbɪleɪ/
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