1. a single piece of information, as a fact, statistic, or code; an item of data.
2. Philosophy. any fact assumed to be a matter of direct observation. any proposition assumed or given, from which conclusions may be drawn.
3. Also called sense datum. Epistemology. the object of knowledge as presented to the mind.Compare ideatum.
4. Surveying, Civil Engineering. any level surface,
"languages can be datum."
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