What is the meaning of selection?

noun

• The act of choosing or selecting.
  • usage: "your choice of colors was unfortunate"; "you can take your pick"
  • synonyms: choice, option, pick
• An assortment of things from which a choice can be made.
  • usage: "the store carried a large selection of shoes"
• The person or thing chosen or selected.
  • usage: "he was my pick for mayor"
  • synonyms: choice, pick
• A natural process resulting in the evolution of organisms best adapted to the environment.
  • synonyms: survival, survival of the fittest, natural selection
• A passage selected from a larger work.
  • usage: "he presented excerpts from William James' philosophical writings"
  • synonyms: excerpt, excerption, extract