Definitions from Wiktionary (datum)

▸ noun:  (philosophy) A fact known from direct observation.
▸ noun:  (philosophy) A premise from which conclusions are drawn.
▸ noun:  (cartography, surveying, engineering) A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system.
▸ noun:  (nautical) A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue.
▸ verb:  To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
▸ Also see datum

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