This meaning refers to the act of facilitating communication or negotiation between two parties, often to resolve a conflict or agreement. It can involve a person or an entity that helps in reaching a consensus.

This meaning pertains to the role of transferring substances, such as pathogens or disease, from one entity to another. It often involves vectors like animals or environments that can spread infections.

This meaning emphasizes the process of negotiation and discussion facilitated by a neutral party to achieve a settlement or agreement.