What does the word caption mean?

Usage examples for caption

  1. Photographs of young women boarding street cars and revealing stretches of leg were printed under the caption, " Indecent Way to Board Car, Says Basine." – Gargoyles by Ben Hecht
  2. You look at the picture but you don't read the names in the caption, so you don't recognize the name, and you haven't been out of your little cage since lunchtime and Jimmy Holden was not missing then. – The Fourth R by George Oliver Smith
  3. We take a photograph of this bachelor homesteader and promise to print it in a city paper under the caption, 'Wife Wanted. – Seeds of Pine by Janey Canuck