Datum

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Datum

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Any numerical or geometrical quantity or set of such quantities which can serve as a reference or a base for measurement of other quantities. </dd>
For a group of statistical references, the plural form is data; as geographic data for a list of latitudes and longitudes. Where the concept is geometrical the plural form is datums; as in two geodetic datums have been used. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use