Entity (usually a bank, but can also be a 3rd party agent) managing all administrative matters of a loan on behalf of the full group of lenders.
Agent responsibilities include: the collection of interest from the borrower and distribution of relevant parts to each lender, dissemination of periodic reporting provided by the borrower to all lenders, centralized communication between the syndicate of lenders and the borrower, maintaining and updating the lender list whenever there are any changes etc.
Also known as Administrative Agent, Facility Agent.