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big data

noun (used with a singular or plural verb)
  1. Computers. data sets, typically consisting of billions or trillions of records, that are so vast and complex that they require new and powerful computational resources to process: Supercomputers can analyze big data to create models of global climate change.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for big data

big data

pl n
  1. computing data held in such large amounts that it can be difficult to process
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012