посре́дница — meaning in English

posrednitsa

English meaning

agent noun A person who acts on behalf of another, especially in business or legal matters.
intercessor noun Someone who intercedes on another person's behalf.
intermediary noun A person or organization that acts as a go-between to help two sides reach an agreement.
mediator noun A neutral person who helps two disagreeing sides reach an agreement.
negotiator noun A person who negotiates, especially on someone else's behalf.

посре́дница is used for these senses in English:

agent One who acts for, or in the place of, another (the principal), by that person's authority; someone entrusted to act on behalf of or in behalf of another, such as to transact business for them.
intercessor A person who intercedes; a mediator; one who reconciles enemies, or pleads for another.
intermediary An agent acting as a mediator between sides to facilitate agreement or cooperation.
mediator One who negotiates between parties seeking mutual agreement.
middlewoman The female equivalent of a middleman; a female intermediary.
negotiator A diplomat, moderator.

noun A person who acts on behalf of another, especially in business or legal matters.
noun A person who works, often secretly, for a government or intelligence organization.
noun A substance or force that produces an effect.

noun Someone who intercedes on another person's behalf.
noun Someone who works to bring opposing sides together, or who speaks up for another person.
noun Someone who acts as a go-between for two other parties.
noun (religion) A saint thought to pray to God for a person who has sinned.