Due process is the entitlement of a citizen to?

Usually refers to rights when subject to law enforcement or judicial action, or agency rulemaking that impacts the rights of citizens - due process meets constitutional requirements, referring to both procedure and substantial rights of citizens. For example, if a citizen has a legal right to land and the government needs to build a freeway through it, the government can't just take it, due process requires at least notice, fair market compensation and opportunity for judicial review of the decision-making.