01 n. Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; -- used chiefly in the plural.
pl.
Data ((#))
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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.“Any writer, therefore, who . . . furnishes us with data sufficient to determine the time in which he wrote.” — Priestley.
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2.
a single piece of information; a fact; especially a piece of information obtained by observation or experiment; -- used mostly in the plural.
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3.
The quantities or relations which are assumed to be given in any problem.(Math.)
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4.
a point, line, or level surface used as a reference in measuring elevations.(Surveying)
Phrases & compounds
Datum line —
the horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc.