replacement

noun

1. 1

   the act of furnishing an equivalent person or thing in the place of another

   replacing the star will not be easy

2. 2

   a person or thing that takes or can take the place of another

3. 3

   an event in which one thing is substituted for another

   the replacement of lost blood by a transfusion of donor blood

4. 4

   a person who follows next in order

   he was President Lincoln's successor

5. 5

   someone who takes the place of another person

6. 6

   filling again by supplying what has been used up