Notional
From Biology-Online Dictionary | Biology-Online Dictionary
notional
1. Consisting of, or conveying, notions or ideas; expressing abstract conceptions.
2. Existing in idea only; visionary; whimsical. Discourses of speculative and notional things. (Evelyn)
3. Given to foolish or visionary expectations; whimsical; fanciful; as, a notional man.