A little girl playing an imaginary game.
- An example of something imaginary is an invisible friend.
- An example of something imaginary is the square root of negative 16.
The definition of imaginary is not real or existing only in the mind, or a square root of a negative number.
imaginary
- existing only in the imagination; fanciful; unreal
- Math. designating or of the square root of a negative quantity, or of a complex number that is not real
Origin of imaginary
Classical Latin imaginariusimaginary
adjective
- Having existence only in the imagination; unreal.
- Mathematics a. Of or being the coefficient of the imaginary unit in a complex number.b. Of, involving, or being an imaginary number.c. Involving only a complex number of which the real part is zero.
noun
pl. i·mag·i·nar·ies Mathematics An imaginary number.
Related Forms:
- i·mag′i·nar′i·ly
adverb
- i·mag′i·nar′i·ness
noun
imaginary
Adjective
(comparative more imaginary, superlative most imaginary)
- existing only in the imagination
- (mathematics) of a number, having no real part; that part of a complex number which is a multiple of the square root of -1.
Noun
(plural imaginaries)
- Imagination; fancy. [from 16th c.]
- (mathematics) An imaginary quantity. [from 18th c.]
Origin
From Middle French imaginaire, from Latin imāginārius (“relating to images, fancied”), from imāgo.