Datum

Noun

  • (plural: data) (philosophy) A premise from which conclusions are drawn.
  • (plural: data) (philosophy) A fact known from direct observation.
  • (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: datums) (cartography, engineering) A fixed reference point.

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