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imaginary unit
i·mag·i·nar·y u·nit
(
plural
i·mag·i·nar·y u·nits
)
noun
Definition:
root of -1:
the positive square root of minus one
Encarta® World English Dictionary [North American Edition] © & (P)2007 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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