[dey-tuhm, dat-uhm, dah-tuhm]
noun, plural data [dey-tuh, dat-uh, dah-tuh] , for 1–3, datums for 4, 5.
a single piece of information, as a fact, statistic, or code; an item of data.
any fact assumed to be a matter of direct observation.
any proposition assumed or given, from which conclusions may be drawn.
Also called sense datum. Epistemology. the object of knowledge as presented to the mind. Compare ideatum.
Surveying, Civil Engineering. any level surface, line, or point used as a reference in measuring elevations.
Surveying. a basis for horizontal control surveys, consisting of the longitude and latitude of a certain point, the azimuth of a certain line from this point, and two constants used in defining the terrestrial spheroid.

1640–50; < Latin: a thing given, neuter past participle of dare to give

data, datum (see usage note at data).

See data.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
datum (ˈdeɪtəm, ˈdɑːtəm)
n , pl -ta
1.  a single piece of information; fact
2.  See also sense datum a proposition taken for granted, often in order to construct some theoretical framework upon it; a given
[C17: from Latin: something given; see data]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

proper L. singular of data (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As such, it has great value in its own right as a datum for future historians and sociologists to reflect upon.
Expertise has been running too high against the datum.
Saying a data element sounds more natural and a datum is also correct though it may sound a bit pretentious.
The datum is used as a basis for calculating imps for the participating teams or pairs.
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