notional

1 :  theoretical, speculative

2 :  existing in the mind only :  imaginary

3 :  given to foolish or fanciful moods or ideas

4a :  of, relating to, or being a notion or idea :  conceptualb (1) :  presenting an idea of a thing, action, or quality has is notional in he has luck, relational in he has gone (2) :  of or representing what exists or occurs in the world of things as distinguished from syntactic categories