successor

noun

1. 1

   A person or thing that immediately follows another in holding an office or title.

   “George W. Bush was successor to Bill Clinton as President of the US.”

2. 2

   The next heir in order or succession.

3. 3

   A person who inherits a title or office.

4. 4

   The integer, ordinal number or cardinal number immediately following another.

   “A limit ordinal is not the successor of any ordinal.”