Etymology

ignorantia juris non excusat

Today it means: Ignorance of the law is not a valid excuse. Full definition →

Latin ignōrantia factī excūsat, ignōrantia jūris nōn excūsat
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The story

  1. Latin · borrowed fromignōrantia factī excūsat, ignōrantia jūris nōn excūsat“ignorance of fact excuses, ignorance of law does not excuse”
  2. English todayignorantia juris non excusat

Borrowed from Latin ignōrantia factī excūsat, ignōrantia jūris nōn excūsat (“ignorance of fact excuses, ignorance of law does not excuse”).

Etymology from Wiktionary, CC BY-SA 4.0.