The quality of being just; fairness. The principle of moral rightness; equity. Conformity to moral rightness in action or attitude; righteousness. The upholding of what is just, especially fair treatment and due reward in accordance with honor, standards, or law. Law The administration and procedure of law. Conformity to truth, fact, or sound reason: The overcharged customer was angry, and with justice. Law A judge. Law A justice of the peace. do justice to To treat adequately, fairly, or with full appreciation: The subject is so complex that I cannot do justice to it in a brief survey.