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One bit of fediverse jargon that gets bandied about without a lot of explanation is "instance".

I am pretty sure we started using it at StatusNet to talk about installations of our software. I am pretty sure it came from the OOP-y and/or POSIX-y sense of "instance", like "an instance of a class" or "a running instance of the program":

https://en.wikipedia.org/wiki/Instance_(computer_science)

It's kind of weird that it's become a term meaning "a domain" or "an account server" or "a community."