Which of the following is defined as a system of guidelines for conducting meetings?

Parliamentary procedure is indeed defined as a system of guidelines for conducting meetings. This structured method is utilized to ensure that meetings are run efficiently and that all members have an opportunity to participate in discussions fairly. Originating from legislative bodies, parliamentary procedure provides a framework for deliberation, decision-making, and maintaining order during meetings.

It outlines specific rules and protocols for various actions such as making motions, voting, and handling amendments, thereby promoting transparency and democratic participation in organizational settings. Having such a system helps groups to manage discussions, prioritize agenda items, and reach conclusions in an organized manner.

While Robert's Rules of Order is a specific set of guidelines derived from parliamentary procedure, it is just one example among others. Procedural standards and discussion frameworks are broader concepts that may not be directly tied to the formalities of meeting conduct as defined by parliamentary procedure. This is why parliamentary procedure is the most fitting choice in the context of the question.