A form of the game of rugby, often amateur, having 15 players per side; points are scored for a try, penalty, drop kick or conversion.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "rugby union" in a sentence
"There have been countless thrilling matches between Aust and NZ over the years in rugby union and it truely is one of the greatest rivalries in sport."