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datum level[′dad·əm ‚lev·əl]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A basic level or line used as a reference for determining heights and depths of points or surfaces in building construction. Within any given city, the established datum level is recorded in the building codes, which control the building standards for that city.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved