First-ever (adjective)

Being the first of its kind; having no previous example.

Origin:

Compound of first and ever.

Examples:

1. It was the first-ever meeting between the two leaders.
2. The company's first-ever product launch was a huge success.
3. It was the first-ever win for the team in the championship.
4. This is the first-ever recorded case of this disease.
5. The concert was the band's first-ever live performance.