Webster's English Dictionary

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datum

da.tum \'da-t-*m, 'dat-, 'da:t-\ \-*\ \-*\ n or da.ta or da.ta or datums 
   [L, fr. neut. of datus] pl  1: something given or admitted esp. as a basis 
   for reasoning or inference  pl but sing or pl in constr  2: factual materal 
   used as a basis esp. for discussion or decision : I NFORMATION pl  3: 
   something used as a basis for calculating or measuring