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öre
øre
ore dressing
Ore Mountains
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ordnance datum
ord·nance da·tum


noun 
Definition:
 
sea level in U.K.: the sea-level standard adopted by the Ordnance Survey in the United Kingdom for mapmaking purposes. It is established as the sea level at Newlyn, in Cornwall.
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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