a. [ L. imaginarius: cf. F. imaginaire. ] Existing only in imagination or fancy; not real; fancied; visionary; ideal. [ 1913 Webster ]
Wilt thou add to all the griefs I suffer
Imaginary ills and fancied tortures? Addison. [ 1913 Webster ]
Imaginary calculus
Imaginary expression
Imaginary quantity
Imaginary points,
lines,
surfaces
n. (Alg.) An imaginary expression or quantity. [ 1913 Webster ]