From Longman Dictionary of Contemporary Englishdata miningˈdata ˌmining noun [uncountable] the process of using a computer to examine large amounts of information, for example about customers, in order to discover things that are not easily seen or noticedFrom Longman Business Dictionarydata miningˈdata ˌmining (also data-mining) noun [uncountable]COMPUTINGMARKETING analyzing large amounts of data about customers held on computer in order to get information about them that is not immediately available or obviousData-mining tools allow marketing departments to identify groups of customers and develop highly targeted mail campaigns.