It depends what features you need. There is a Glossary plugin that displays all terms and definitions in tabs which all looks pretty good. https://marketplace.atlassian.com/plugins/fr.spectrumgroupe.confluence.plugins.glossary/server/overview
I just use a glossary to reuse definitions across Confluence. My own method is to create a glossary space which is open to everyone in the organisation. Each definition has its own page and the pages are arranged alphabetically. They are easily accessed from the Glossary space home page with the Children Display macro or Page Tree macro. In practice no-one really looks at these definitions apart from the tech writer ie myself.
The useful part is where the definitions are then reused across the site either in text or as tooltips using the Excerpt or Multiexcerpt plugin. Use the Tooltips plugin to create tooltips - https://marketplace.atlassian.com/plugins/com.m20tech.tooltips/server/overview
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