nulla poena sine lege
C2CEFR level
95/100Rarity: very rare
TechnicalRegister
The principle that there can be no punishment without a pre-existing law creating the offence.
Retrospective criminal liability would violate nulla poena sine lege.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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