From Longman Dictionary of Contemporary Englishfirst-everˌfirst-ˈever adjective [only before noun] FIRSThappening for the first time her first-ever television interview the first-ever visit to China by an American president
Examples from the Corpus
first-ever• Released 25 years ago, the recording became the unofficial anthem of my first-ever election campaign.• According to the official program of the Games, it was the first-ever Olympic triathlon.• However, this is by no means the first-ever space station. 