What does the word background mean?

Usage examples for background

  1. The river kept the pilot ambition always fresh, and the cave supplied a background for those other things. – Mark Twain, A Biography, Vol. 1, Part 1, 1835-1866 The Personal And Literary Life Of Samuel Langhorne Clemens by Albert Bigelow Paine
  2. If we had a water background, now. – Into the Primitive by Robert Ames Bennet
  3. Certain girls have kept strictly in the background. – Grace Harlowe's Second Year at Overton College by Jessie Graham Flower