Can you help me understand what you mean by spiritual?

I confess I have no direct experience with anything I've ever had the impulse to call "spiritual". This makes me wonder if I think the word means something different than most, or am I missing some kind of subjective experience others have?

I assume spiritual doesn't literally mean spirit, like the whispy ghost that floats up when you die in the cartoons. I assume it means something like a negative definition. Take everything we know and can understand about empirical reality, then whatever remains is "spiritual".