Definition of imaginary

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rationale
Definition: (noun) an underlying reason or explanation.
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i·mag·i·nar·y

(

-m

-n

) KEY

ADJECTIVE:

Having existence only in the imagination; unreal.
Mathematics
1. Of or being the coefficient of the imaginary unit in a complex number.
2. Of, involving, or being an imaginary number.
3. Involving only a complex number of which the real part is zero.

NOUN:
Mathematics pl. i·mag·i·nar·ies

An imaginary number.

OTHER FORMS:
i·magi·nari·ly(Adverb), i·magi·nari·ness(Noun)

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