I considered that quite a lot while contributing to the repo but it's super easy to go overboard and turn a single definition into many pages of explanation. I feel that this glossary should be just a taste of the concepts in a shallow, practical, and hand-wavy way.

To be honest, each concept like "partial application", or "applicative functors" deserves an hour-long lecture or more but if the content went that deep I think it'd lose its current audience.