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Datum vs Undefined - What's the difference?

datum | undefined |

As a noun datum

is date (point of time at which a transaction or event takes place).

As an adjective undefined is

lacking a definition or value.

datum

English

Noun

(en-noun)
  • (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.
  • (plural: data ) (philosophy) A fact known from direct observation.
  • (plural: data ) (philosophy) A premise from which conclusions are drawn.
  • (plural: datums ) (cartography, engineering) A fixed reference point.
  • * 2007 , Roger F Tomlinson, Thinking about GIS: geographic information system planning for managers
    • Datums are another important map aspect related to projection. A datum provides a base reference for measuring locations on Earth's surface.

    Derived terms

    * datum circle * datum line * datum plane * datum point * datum surface

    Related terms

    * data, information * die, dice

    References

    * AskOxford.com: Is 'data' singular or plural? * (The American Heritage Dictionary's usage note on 'data') * John Quiggin: Data is not the plural of datum * johnaugust.com: ‘Data’ is singular English nouns with irregular plurals English words affected by prescriptivism ----

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined