intercessor
in·ter·ces·sor
noun
1.
a negotiator who acts as a link between parties
Origin
Late 15th century, from Latin intercessor, from Latin intercēdō, from inter (“between”) + cēdō (“to go”) (English cede), literally “go-between”.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.