Datum
/dˈætəm/
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Definition
(noun) Something known or assumed as fact, and is made the basis of reasoning or inference which an intellectual system of any sort (such as knowledge or theoretical framework) is constructed.
Sentence Examples
A tide gauge measures changes in sea level relative to a datum (a height reference).
The singular of 'data' is 'datum'.
CEFR Practice Quiz
A tide gauge measures changes in sea level relative to a ____ (a height reference).