an item of factual information derived from measurement or research
"The survey team compiled a crucial datum regarding soil erosion rates to update their environmental report."
A measurement of something on a scale understood by both the recorder (a person or device) and the reader (another person or device). The scale is arbitrarily defined, such as from 1 to 10 by ones, 1 to 100 by 0.1, or simply true or false, on or off, yes, no, or maybe, etc.
"The calibration report showed that the new sensor was recording a temperature datum of forty-five degrees Celsius, which matched the manual reading exactly."
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
"The engineer filled in the temperature readings for the extreme cold snaps by datuming the sensor's limited output with a predictive algorithm."