I don't know if that's the best way to say but, titles means almost nothing nowadays. That's not myself stating it. Take a look at THIS article, for instance.
It is important - and I believe that's what you're trying to do - to understand what are your roles within the company. So, based on it, I'd go for angeline's (+1!) answer:
**Your company - _that gave you the title_ \- is the only one able to clarify you your roles.**
There's a very goood article on INC that states 8 qualities of remarkable employees. Take a look at number one.
Understand and enjoy your new role, in despite of the title it has.
Success!