Pressbooks has a plugin that allows writers to produce a glossary for their work. When users hover their cursor over a glossed word, a brief explanation appears on screen. For example, try hovering your cursor over this term: H5P.  You should see a dialogue box pop up that resembles the image below:

example of the gloss that appears when a user hovers their mouse over a word that is in the project's glossary

Henry Jenkins models the use of a glossary of key terms in his recent work, Convergence Culture, and does so with a prefatory note that bears inclusion in this document:

Books about media and popular culture are often criticized for their use of academic argon, yet the business, fan, and creative communities have their own specialized languages for talking about the issues this book addresses. In writing this book I have been highly conscious of minimizing the use of terms that will impede my ability to reach the possible range of readers, preferring where possible the term already being used in and around the media industry to terms that are primarily used in academic circles. But because this book cuts across multiple communities, each with its own slang and jargon, I am providing this glossary of core terms. Many of these words or phrases have multiple meanings in different contexts; my focus is on the ways they are deployed in this book’s discussions. One of my goals in writing this book is to push toward a common language that will allow greater collaboration and negotiation between those sectors where media change is taking place.  (279)