What does the word agent mean?

Usage examples for agent

  1. " That will pay me, and leave a dollar over," suggested the agent. – The Young Musician or, Fighting His Way by Horatio Alger
  2. " Not his fault," the Paratime Police agent said. – Time Crime by H. Beam Piper
  3. The agent may be caught. – Memoirs of Sherlock Holmes by Sir Arthur Conan Doyle