What is a true Dom

Thank you to Florida Dom who commented back on my last post. I felt a connection with FD while reading his comment. But one paragraph stuck out at me...

'I'm not sure whether you're a true dom or whether you realize your wife has these needs and you're being a good husband and providing them to her. Either way, if you keep doing it, it will be good for your relationship.'

...now I'm not sure what a true Dom is? I have a kind of fuzzy notion of it developing but no text book answer (not that I expect there to be in this crazy world). But my nature is to seek clarity and I would like to do that in the style of FD and pose a question.

What is a true Dom?