GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Datum , n.; pl. Data . [L. See 2d Date.]
   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
   a single piece of information; a fact; especially a piece of information obtained by observation or experiment; -- used mostly in the plural.
   PJC
   pl. (Math.) The quantities or relations which are assumed to be given in any problem.
   1913 Webster
   (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