1. (noun)
complex number, complex quantity, imaginary number, imaginary
- (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1 Synonyms: complex quantity, complex number, imaginary, imaginary number
2. (adj)
fanciful, imaginary, notional
- not based on fact; unreal Synonyms: conceptional, ideational, speculative, notional, imaginary, fanciful