How do I create a Sharepoint glossary without using an app?

Hi AMJ_Devon ,

A customized list can be a simple solution to host your glossary.

What I would do a little bit more is to:

1. Create a list called "Alphabet".
   • Configure a customized column called "Initials"
   • Then Create 26 items starting from A to Z;
2. Create another list called "Glossary".
   • Configure the list with all the customized columns you want. For example, definition, submitted by...
   • Then add another column called "Initials"(and make this field mandatory too)
   • Then add all the glossary you have as items (Remember to fill out the “Initials” column for your glossary). 
3. Create a SharePoint page and add these two lists there as two web parts (side by side, or up and down).
4. Use "Dynamic Filter" to connect these two web parts.

In this way, you should be able to avoid being redirected to a new page when clicking on an initial.