1.substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected);
He replaced the old razor blade
2.take the place or move into the position of;
Smith replaced Miller as CEO after Miller left
3.put in the place of another; switch seemingly equivalent items;
the con artist replaced the original with a fake Rembrandt
4.put something back where it belongs;
replace the book on the shelf after you have finished reading it