Datum line
Datum Da"tum, n.; pl. {Data}. [L. See 2d {Date}.] 1. Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; -- used chiefly in the plural. [1913 Webster]

Any writer, therefore, who . . . furnishes us with data sufficient to determine the time in which he wrote. --Priestley. [1913 Webster]

2. a single piece of information; a fact; especially a piece of information obtained by observation or experiment; -- used mostly in the plural. [PJC]

3. pl. (Math.) The quantities or relations which are assumed to be given in any problem. [1913 Webster]

4. (Surveying) a point, line, or level surface used as a reference in measuring elevations. --RHUD [PJC]

{Datum line} (Surv.), the horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc. [1913 Webster] ||


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • datum line — datum line, datum level or datum plane noun The horizontal baseline from which heights and depths are measured • • • Main Entry: ↑datum …   Useful english dictionary

  • datum(line) — pagrindinė linija statusas T sritis chemija apibrėžtis Grafinės priklausomybės linija, kai sistemoje nevyksta pokyčiai. atitikmenys: angl. base(line); datum(line) rus. базовая линия …   Chemijos terminų aiškinamasis žodynas

  • datum line — n. datum level, reference line from which heights and depths are measured …   English contemporary dictionary

  • datum line — A baseline, or reference line, from which calculations or measurements are taken. See datum …   Aviation dictionary

  • datum line — (also datum level) noun a standard of comparison or point of reference. ↘Surveying an assumed surface used as a reference for the measurement of heights and depths …   English new terms dictionary

  • datum line — noun A fixed, measurable line, used as a reference from which angular or linear measurements are taken …   Wiktionary

  • lateral datum line — An imaginary line through the aircraft’s center of gravity usually considered parallel to a line joining the wing tips …   Aviation dictionary

  • datum level — datum line, datum level or datum plane noun The horizontal baseline from which heights and depths are measured • • • Main Entry: ↑datum * * * datum level, datum line, datum plane, or …   Useful english dictionary

  • datum plane — datum line, datum level or datum plane noun The horizontal baseline from which heights and depths are measured • • • Main Entry: ↑datum * * * datum level, datum line, datum plane, or …   Useful english dictionary

  • datum point — noun A reference point against which measurements and comparisons can be made • • • Main Entry: ↑datum * * * datum level, datum line, datum plane, or datum point, a level, line, plane, or point, from which heights a …   Useful english dictionary

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