archrival + -ry
archrivalry (countable and uncountable, plural archrivalries)
- The relationship between two or more archrivals. The term usually applies to two archrivals.
- The archrivalry between the New York Yankees and the Boston Red Sox is probably the most famous in baseball.
1944 July 1, Briton Hadden; Henry Robinson Luce, Time, volume 44, Time Inc.:
- Although the Swedish track season is only a month old, the arch-rivalry has already produced three other world's records.