Imagination; fancy. / (mathematics) An imaginary quantity.

Existing only in the imagination. / (mathematics, of a number) Having no real part; that part of a complex number which is a multiple of √ (called imaginary unit).

plural of imaginary

the state of being imaginary

plural of imaginary number

plural of imaginary part

(number theory, complex analysis, quaternion theory) An imaginary number (in the case of complex numbers, usually denoted i) that is defined as a solution to the equation i²=-1.

(complex analysis) Of a number, having real part equal to zero.

(complex analysis) Of a complex number a + bi, where a and b are real numbers, the value b.

(complex analysis, strict sense) A number of the form bi, where b is any real number and i denotes the imaginary unit.