Definify.com
Webster 1913 Edition
Datum
‖
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.
3.
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.
Webster 1828 Edition
Datum
DA'TUM
,Noun.
DATU'RA, n. A vegeto-alkali obtained from Datura stramonium.
DAUB, v.t.