- imaginary⇄adj. 1. existing only in the imagination; not real.
Ex. Ghosts are imaginary. The equator is an imaginary circle around the earth.
(SYN) illusory.
2. (Mathematics.) of or having to do with the even root of a negative number or any exp - imaginary⇄imaginary, adjective, noun.
- imaginary⇄noun (Mathematics.) an imaginary number or expression.