Definition of datum noun from the Oxford Advanced Learner's Dictionary

 

datum

 noun
noun
BrE BrE//ˈdeɪtəm//
 
; NAmE NAmE//ˈdeɪtəm//
 
(pl. data)(specialist)
 
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a fact or piece of information see also data More Like This Easily-confused plural/​singular forms bacteria/​bacterium, criteria/​criterion, data/​datum, media/​medium, phenomena/​phenomenon, strata/​stratumSee worksheet. Word Origin mid 18th cent.: from Latin, literally ‘something given’, neuter past participle of dare ‘give’.
See the Oxford Advanced American Dictionary entry: datum