A middleman, intermediary
A bishop who acts during a vacancy in a see.
A person who intercedes; a mediator; one who reconciles enemies, or pleads for another.
An intermediary.
Any substance formed as part of a series of chemical reactions that is not the end-product.
Anything in an intermediate position.
Being between two extremes, or in the middle of a range.
To mediate, to be an intermediate.
To arrange, in the manner of a broker.