> the only time i've ever read the word 'delulu'; I had to look it up. I'm going to be honest, I fully expect dictionaries to contain the definition of words I

> the only time i've ever read the word 'delulu'; I had to look it up. I'm going to be honest, I fully expect dictionaries to contain the definition of words I have to look up. What would be the point of a dictionary (or really any reference book) that only contains things I already know?