We are pround to annouce the launch of our Glossary blueprint for confluence
It's easy to use and it lets you manage thousands of terms and their definitions inside a smart wiki page tree. Use it to add new letters, create terms and use live-search to quickly find a specific term.
Glossary macro is not a bundled Confluence plugin therefore it could be a third-party plugin or a user macro which I'm unsure of if it's compatible with the latest Confluence version. Have you checked from Confluence Admin > Plugin, if the plugin that supply the macro is disabled?
Alternatively, you may be interested to check out these links which offers the use of Glossary in Confluence:
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