What’s a more persistent alternative to tooltips?

I'm designing a dashboard that includes some jargon that is not yet commonly known in the client's industry. This includes terms that would need to further give details of how certain things are calculated in the dashboard.

The most common way of handling this issue might be simply using a tool tip next to the word itself. However, tool tips are known to have their own issues and could be missed.

My question is what's a better way to show the meaning of the words used in the dashboard without hiding them behind a click? A popup might be a solution but once it's dismissed it needs to be able to be accessed again quite easily.