Notional
Part of speech: adjective
Definition: Of, containing, or being a notion; mental or imaginary. Speculative, theoretical, not the result of research. Having descriptive value as opposed to a syntactic category. Of, containing, or being a notion; mental or imaginary.
Imaginary
Part of speech: adjective
Definition: existing only in the imaginationof a number, having no real part; that part of a complex number which is a multiple of the square root of -1.
Example sentence: Actually, Keke is my nickname. When I was little, my sister was about four years old, and she had an imaginary friend named Keke. And she wanted my name to be Keke.