an agent is a person, organization, or entity that is authorized to act on behalf of another

act actor advocate agent ambassador appointed arbiter arbitrator attache attorney authorized backer behalf broker commissioner conduit confidential connection courier custodian delegate diplomat emissary enforcer entity envoy executor facilitator fiduciary gobetween handler helper instrument intercessor intermediary legal liaison mandate mandated mediator middleman negotiator organization person power principal promoter protector proxy rep representative spokesperson steward surrogate trustee