Datum meaning

dā'təm, dăt'əm, dä'təm
(plural: data) (philosophy) A fact known from direct observation.
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Something known or assumed; information from which conclusions can be inferred.
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The definition of a datum is a fact used to make a conclusion or a point of reference in geography or geology.

An example of a datum is a new scientific discovery used to reach a conclusion about the common cold.

An example of a datum is the assumed altitude of a specific piece of land used as the basis in calculating the altitude of the top of a mountain on the land.

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A point, line, or surface used as a reference, as in surveying, mapping, or geology.
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A real or assumed thing, used as a basis for calculations or measurements, as a level (also datum plane) from which elevations and depths are measured in surveying.
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The 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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(plural: data) A measurement of something on a scale understood by both the recorder (a person or device) and the reader (another person or device). The scale is arbitrarily defined, such as from 1 to 10 by ones, 1 to 100 by 0.1, or simply true or false, on or off, yes, no, or maybe, etc.
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(plural: data) (philosophy) A premise from which conclusions are drawn.
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(plural: datums) (cartography, engineering) A fixed reference point.
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A fact or proposition used to draw a conclusion or make a decision.
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Origin of datum

Latin something given from neuter past participle of dare to give dō- in Indo-European roots