What is the meaning of replacing?

noun

• The act of furnishing an equivalent person or thing in the place of another.
  • usage: "replacing the star will not be easy"
  • synonyms: replacement

verb

• Substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected. )
  • usage: "He replaced the old razor blade"; "We need to replace the secretary that left a month ago"; "the insurance will replace the lost income"; "This antique vase can never be replaced"
  • synonyms: replace
• Take the place or move into the position of.
  • usage: "Smith replaced Miller as CEO after Miller left"; "the computer has supplanted the slide rule"; "Mary replaced Susan as the team's captain and the highest-ranked player in the school"
  • synonyms: supplant, replace, supersede, supervene upon, supercede
• Put something back where it belongs.
  • usage: "replace the book on the shelf after you have finished reading it"; "please put the clean dishes back in the cabinet when you have washed them"
  • synonyms: replace, put back
• Put in the place of another; switch seemingly equivalent items.
  • usage: "the con artist replaced the original with a fake Rembrandt"; "substitute regular milk with fat-free milk"; "synonyms can be interchanged without a changing the context's meaning"
  • synonyms: substitute, replace, interchange, exchange