A glossary can be a powerful way for the author to build up context over time and for the reader to easily get a more detailed view of the author’s work when getting acquainted with it, while not being overloaded with contextual information which becomes obvious to the reader over time. I have worked on different aspects of a glossary system over time, with key articles listed below, but I feel it’s likely we will not be able to cover this properly in the early versions of the Reader.
http://wordpress.liquid.info/06/visual-meta-glossary/frode/ glossary in visual-meta
http://wordpress.liquid.info/06/glossary-and-citation-in-dynamic-view-dynamic-view/frode/ dynamic views of terms
http://wordpress.liquid.info/06/glossary-and-citation-in-dynamic-view-in-an-integrated-way/frode/ to define a term