This is actually something I think is a pretty big failing in a lot of internet publishing

You could easily turn those terms in the article into hyperlinks to definitions.

You could even have the links go to definitions hosted on your own website to boost page reads and ad counts if you really wanted to

Most user agents allow you to trivially search from selection. Double-click unfamiliar word, right click, select "search" or on macOS there's also "lookup" but that really only works on dictionary words.