People have a lot of definitions of sacrifice. The one I hear most often is that sacrifice is giving up something good for something better.
I think there is a better way of looking at it, or at least a more beautiful way of looking at it. Sacrifice is giving up something you want so that someone else can have something they want...because you love them.
I've seen so many examples of this lately. From the simple, to the life changing. From going to see a friend when you really wanted to take a nap, to quitting the job you always wanted to get a higher paying one to help your parents who are struggling financially. In either case, the motivation was not the hope of something better in return.
It was pure love.