1) Broadly, one who acts or has the power to act: more usually, one that acts as the representative of another. Most frequently in travel, a specific kind of agent such as a retail travel agent. 2) Person that obtains engagements for entertainers, is paid by the entertainers and has no contract for production responsibilities. 3) Person in a speaker bureau/agency that acts on behalf of the seller (speaker) or on behalf of the buyer (customer).