Both Uses of
successor
in
The City of Ember
- When she grew old, and her time as mayor was up, she explained about the box to her successor, who also kept the secret carefully, as did the next mayor.
p. 2.5successor = replacement
- [the seventh mayor] ...before he could return the box to its official hiding place or tell his successor about it, he died.
p. 3.2 *
Definition:
replacement -- typically a person who takes the job of another person, but it can also be a thing that replaces something else