Imaginary definition

ĭ-măjə-nĕrē
Frequency:
Having existence only in the imagination; unreal.
adjective
10
5
An imaginary number.
noun
5
4
(mathematics) Of a number, having no real part; that part of a complex number which is a multiple of the square root of -1.
adjective
2
1
Existing only in the imagination; fanciful; unreal.
adjective
4
4
Involving only a complex number of which the real part is zero.
adjective
1
1
Advertisement
Imagination; fancy. [from 16th c.]
noun
1
1
(mathematics) An imaginary quantity. [from 18th c.]
noun
1
1
(math.) Designating or of the square root of a negative quantity, or of a complex number that is not real.
adjective
4
5
The definition of imaginary is not real or existing only in the mind, or a square root of a negative number.

An example of something imaginary is an invisible friend.

An example of something imaginary is the square root of negative 16.

adjective
1
2
Of or being the coefficient of the imaginary unit in a complex number.
adjective
0
2
Advertisement
Of, involving, or being an imaginary number.
adjective
0
2
adjective
0
2

Other Word Forms

Noun

Singular:
imaginary
Plural:
imaginaries

Origin of imaginary

  • From Middle French imaginaire, from Latin imāginārius (“relating to images, fancied”), from imāgo.

    From Wiktionary