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Related to datum: datum line
a proposition taken for granted, often in order to construct some theoretical framework upon it; a given
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A point with a given coordinate in space from which other heights and depths can be measured.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
datum[′dad·əm, ′dād·əm, or ′däd·əm]
A direction, level, or position from which angles, heights, speeds or distances are conveniently measured.
Any numerical or geometric quantity or value that serves as a base reference for other quantities or values (such as a point, line, or surface in relation to which others are determined).
The latitude and longitude of an initial point; the azimuth of a line from this point.
The top or bottom of a bed of rock on which structure contours are drawn.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A level surface or point to which other levels are related; a reference in measuring elevations.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
datumThe singular form of data; for example, one datum. It is rarely used, and data, its plural form, is commonly used for both singular and plural.
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