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Juno for YouTube has been removed from the App Store
(christianselig.com)
This is a most excellent place for technology news and articles.
It has a definition already, which is the same it always has been. And no, you don't need to differentiate this. We've always installed applications from outside sources. Hell, until recently there weren't even official app stores and shit. Locked down operating systems where you only get what the tech giant wants you to get is a very recent development in order to take control away from the user.
The reality is that there is a difference now, and it needs to be clarified. How would you, talking to another regular human being communicate to install an app that isn't in the official app store succinctly? If you just tell someone to 'install the app' then you are doing a bad job communicating. Economy of language means that new words are going to form to distill common concepts.
Package managers have existed for a long time, so the concept of app stores isn't new and is actually generally the accepted solution by the open source community. It's typically regarded as the safest way to install software as it comes with auditing and active management.
Side loading does a great job at communicating what is being done, and it helps consolidate the various ways you actually install applications into a nice generic term.
A store being locked down doesn't really have much to do with the concept of side loading anyway, since a locked down device doesn't support it in the first place.