What is the legal definition of a "prohibition"?

The legal definition of a "prohibition" indeed refers to an order issued by a higher court to a lower court or an official, directing them to refrain from undertaking specific actions. This judicial directive acts as a powerful tool to maintain the proper administration of justice and to prevent lower courts or parties from acting beyond their authority or in a manner contrary to established legal principles. Such orders can be crucial in ensuring that legal proceedings adhere to proper protocols and do not lead to the violation of rights or legal statutes.

In the context of the other options, while they are all parts of the legal process, they do not accurately capture the meaning of "prohibition." For instance, warnings from law enforcement generally pertain to preventive measures against crime rather than a specific order from a court. Requests for retrials are procedural motions made by defendants seeking to revisit verdicts but do not relate to prohibitory actions. Lastly, plea bargaining is a negotiation process in criminal cases seeking to resolve charges without going to trial, which is also unrelated to the concept of prohibition as defined in legal terms.