[dey-tuhm, dat-uhm, dah-tuhm] 
[dey-tuh, dat-uh, dah-tuh] for 1–3, da⋅tums for 4, 5. | 1. | a single piece of information, as a fact, statistic, or code; an item of data. |
| 2. | Philosophy.
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| 3. | Also called sense datum. Epistemology. the object of knowledge as presented to the mind. Compare ideatum. |
| 4. | Surveying, Civil Engineering. any level surface, line, or point used as a reference in measuring elevations. |
| 5. | 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. |
| sense datum n. A basic unanalyzable sensation, such as a color or smell, experienced upon stimulation of a sense organ or receptor. |
sense datum n.
A basic, unanalyzable sensation, such as color, sound, or smell, experienced upon stimulation of a sense organ or receptor.