What does the word amateur mean?

Usage examples for amateur

  1. " He would fancy himself an amateur detective at once," she said to her aunt. – Barbara in Brittany by E. A. Gillie
  2. He also is an amateur of nature. – Aspects of Literature by J. Middleton Murry
  3. If he were not a great scientist, I should say he was exaggerating like an amateur. – The Universe a Vast Electric Organism by George Woodward Warder