This is just a random idea that I haven't put a whole lot of thought into yet... I'm not suggesting these are good definitions/descriptions. Consider yourself warned.
Te: what people/things are doing
Fe: how people/things are feeling
Si: what people/things are doing with each other
Ni: what people/things have, will, or could be doing with each other
Se: the existing characteristics of people/things
Ne: the potential characteristics of people/things
Ti: what people/things are in relation to each other
Fi: how people/things feel in relation to each other