IMPOTENTIA EXCUSAT LEGEM TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.Latin, meaning Impossibility is an excuse in the law. Related Posts:IGNORANTIA FACTI EXCUSAT IGNORANTIA JURIS NON EXCUSATIGNORANTIA LEGIS NON EXCUSATINJURIA NON EXCUSAT INJURIAMIGNORANCE OF THE LAWIMPOTENCENECESSITAS NON HABET LEGEM