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unit cell
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unit of trade
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unit vector
u·nit vec·tor (plural u·nit vec·tors)


noun 
Definition:
 
vector one unit long: a vector that is one unit in length, especially lying along a coordinate axis
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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