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datum

da·tum [ dáytəm, dáttəm ] (plural da·ta [ dáytə, dáttə ])


noun 
Definition:
 
1. item of information: a piece of information

2. logic given fact: a known or assumed fact that is used as the basis for a theory, conclusion, or inference

3.  (plural da·tums) maps point of reference: a point, line, or surface used as a basis for measurement or calculation in mapping or surveying

[Mid-18th century. < Latin (see data)]
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