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[fzngagan (Faizaan Gagan)]

@abrambailey

but it would be very handy if we could add system definitions and have defined terms and acronyms be automatically underlined without the user setting the [dict] tag.

We have Linkify Words Theme Component but it goes only as far as converting an appearance of a word to a link. It can certainly be forked to achieve what you’re suggesting. You can hire a developer from marketplace if you’re happy to sponsor the work.