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(mal-uhm in say) adv. Latin referring to an act that is "wrong in itself," in its very nature being illegal because it violates the natural, moral or public principles of a civilized society. In criminal law it is one of the collection of crimes which are traditional and not just created by statute, which are "malum prohibitum." Example: murder, rape, burglary and robbery are malum in se, while violations of the Securities and Exchange Act or most "white collar crimes" are malum prohibitum.