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1 definition found
 for Datum line
From The Collaborative International Dictionary of English v.0.48 :

  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.
     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
     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]

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