It's just not practical, therefore we try to include at least a few and place the best uses towards the top.

As an example, take the word irresolute. Although we provided five uses of the word, we know that irresolute is also used in War and Peace, Wuthering Heights, Moby Dick, Uncle Tom's Cabin, Treasure Island, Frankenstein, The Adventures of Tom Sawyer, The Count of Monte-Cristo, Jane Eyre, Ulysses, and over a dozen other titles that we are aware of. This may be an extreme example as irresolute is (what we call) a core vocab word, but it illustrates the point.