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).

the state of being imaginary

plural of imaginary

(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.

(mathematics) The vertical line in the complex plane, every point on which corresponds to a complex number having zero real component

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

(geometry) Absolute geometry, an axiomatised geometry in which the parallel postulate is absent and not replaced by an alternative, and of which Euclidean geometry and some non-Euclidean geometries are subtypes.

plural of imaginary axis