not based on fact; dubious; "the falsehood about some fanciful secret treaties"- F.D.Roosevelt; "a small child's imaginary friends"; "her imagined fame"; "to create a notional world for oneself"
not based on fact; dubious; "the falsehood about some fanciful secret treaties"- F.D.Roosevelt; "a small child''s imaginary friends"; "her imagined fame"; "to create a notional world for oneself"
(mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1