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datum line
datum line (plural datum lines) or datum level (plural datum levels) or datum plane (plural datum planes)


noun 
Definition:
 
line of reference: the horizontal line or plane from which all other heights and depths are measured or calculated on a map or chart
Encarta® World English Dictionary [World English Edition] © & (P)2008 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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