The term Jedi may indeed be referring to the official title.
There's a movie on the FB page for Rebels and in it Dave Filoni says that Ahoska isn't a Jedi, he talks about her blades being white because she's no longer a Jedi, but she's also not evil.
So clearly they're making room for non-Jedi force users. You could argue that Kanan and Ezra are both in that same category. It hasn't been said one way or another that I know of, but it's sorta hinted at that Kanan hasn't finished his trials yet. So he's not a full fledged Jedi, the Inquisidor asked him about his masters last command when Order 66 was issued. Made it sound like maybe he was still a Padawan.
Exactly, being force sensitive does not mean you're a Jedi or a Sith. I'm sure the Inquisitor had posters of Darth Vader hanging on his wall, but he could never become a Sith lord.
Edited by Deltmi