公正 (gōngzhèng) means 'just, fair' and emphasizes impartiality based on principles or law, often used in formal contexts like judgments or policies. It is more principled than 公平 (gōngpíng), which stresses equal treatment or distribution, and more formal than the colloquial 公道 (gōngdao). Use 公正 when fairness arises from a standard of rightness, not just equal shares.