All words have meaning. There are formal definitions that you’d find in a reputable dictionary. And then there are the real definitions: the ones that remain unspoken. That’s why the Uselesstuff® Dictionary exists.
ra·tio·nal·i·za·tion (n.):
1. the reasoning that you’re currently thinking up to justify the unnecessary purchase of this product;
2. the reasoning that you’re currently thinking up to justify the unnecessary purchase of this shirt.