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prime cost
prime interest rate
prime meridian
prime minister
prime mover
prime number
prime rate
prime time
prime vertical
primer (1)
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prime vertical
prime ver·ti·cal


noun 
Definition:
 
great circle around Earth: the imaginary circle around Earth that goes through the highest point of the celestial sphere directly above an observer and meets the horizon at east and west
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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