the offense of killing a human being with malice prepense or aforethought, express or implied; intentional and unlawful homicide.-to kill with premediated malice; to kill (a human being) willfully, deliberately, and unlawfully. see murder, n.-to destroy; to put an end to.-to mutilate, spoil, or deform, as if with malice or cruelty; to mangle; as, to murder the king's english.