Additional (adjective)

1. Being or happening as an addition.
2. Added to what was already there or already happening.
3. Being or representing an increase or supplement.
4. Being one more or an extra one.
5. Being additional information or details.

Origin:

Late middle english, from latin addītiōnālis, from addītiō addition.

Examples:

1. They are hiring additional staff for the holiday season.
2. The additional data supports the conclusion.
3. The company will provide an additional bonus for outstanding performance.
4. The additional chapters gave more background information on the characters.
5. She ordered an additional side of fries with her burger.