Merriam-Webster defines the word rival as:
a : one of two or more striving to reach or obtain something that only one can possess
b : one striving for competitive advantage
Specific to college football, rivals, and rivalries are constantly evolving, growing and shrinking in terms of importance and relevance. What makes an opponent a rival, and what makes a rivalry intense? I think in most cases it goes without saying that teams who play annually, and are in close proximity stand a better chance of developing a rivalry. There are plenty of other qualifiers, both general and distinct, but above all, in my opinion rivals give as good as they take, and the most bitter rivalries develop when the stakes are the highest.
Who are our rivals and how do they rank in terms of current relevance, all-time relevance, loatheability, and must win?