Hypertext Webster Gateway: "datum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
Any writer, therefore, who . . . furnishes us with
data sufficient to determine the time in which he
wrote. --Priestley.
2. pl. (Math.) The quantities or relations which are assumed
to be given in any problem.
{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.
From WordNet (r) 1.7 (wn)
datum
n : an item of factual information derived from measurement or
research [syn: {data point}]
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