Multistakeholderism is not difficult to define,
The study and practice of forms of participatory democracy that allow for all those who have a stake and who have the inclination, to participate on equal footing in the deliberation of issues and the recommendation of solutions. While final decisions and implementation may be assigned to a single stakeholder group, these decision makers are always accountable to all of the stakeholders for their decisions and the implementations.
It is just hard to live up to.
Multistakeholderism: nature and practice 