In legal terminology, mens rea refers to the mental element or guilty mind required for criminal liability.
From Latin 'rea' meaning 'guilty party' or 'defendant,' from 'reus' meaning 'accused person.' Used in legal contexts since medieval times, particularly in the phrase 'mens rea' (guilty mind).
The concept of mens rea is fundamental to criminal law because it distinguishes between accidents and intentional crimes - you generally can't be convicted of a serious crime without proving you had criminal intent. This principle dates back to Roman law and the maxim 'actus non facit reum nisi mens sit rea' (an act does not make one guilty unless the mind is guilty).
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