Loyalty is a word that people seem to find a myriad of definitions for. Some people have loyalties that shift as the winds change course. They view loyalty as their own means to an end.
It's not like that.
To me, loyalty is not a word. It is a concept, an understanding...a way of life. Loyalty is the thread that weaves your world together and binds your life to your ideals and the ones you love. It is the leash that those who love you use to try to keep you from doing something rash or dangerous to yourself.
Loyalty means that you face down whomever and whatever you must face in order to keep those who rely on you safe and secure. It's an ideal that cannot be structured and it's an emotion that causes you to often look out for others before you look out for yourself.