Affiliated with the NWA once again , the WWWF was renamed to World Wrestling Federation ( WWF ) in 1979 , and after conclusively ending its affiliation with the NWA in 1983 , the championship became known as the WWF World Heavyweight Championship and later simply as the WWF Championship by the 1990s .
Affiliated with the NWA once again , the WWWF was renamed to World Wrestling Federation ( WWF ) in 1979 .