Meaning of the word "an additional one" in English

What does "an additional one" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

an additional one

US /ən əˈdɪʃənəl wʌn/
UK /ən əˈdɪʃənəl wʌn/

Phrase

one more; an extra item or person

Example:
Can I have an additional one of those cookies?
We need an additional one to complete the team.