If the Stackexchange framework supports the process the site glossary may be a blog-post, or even simply a specific question with the title Glossary as is done here.
The answers could have relevant hyperlink, abbreviation, acronym, and description. A user could post an answer to add a term. The system would take care of the edit history, and site user sensibility would take care of the suitability of the term itself by way of upvote/downvote/flag for attention mechanism.
The glossary question itself could (assuming again the SE framework is so flexible) be made available on the 'Ask Question' page. This could allow any incoming user to refer/add to the glossary as necessary.
Of course it is moot how many people would choose to utilize/contribute to such a facility. Those who do may well be the persons who even as yet provide references/quotes. For those who do not - a 'Glossary' question may perhaps provide a visible option to do the right thing