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From Longman Dictionary of Contemporary English
Related topics: Maths, Computers
BooleanBoo·le·an /ˈbuːliən/ adjective [only before noun] technical  a Boolean system is based on things that can be either true or false, but not both. It links statements with words called operators, such as AND, OR, and NOT. Boolean systems are used to write computer programs, especially Internet search programs The program searches for information using Boolean logic.
From Longman Business DictionaryBooleanBoo‧le‧an /ˈbuːliən/ adjective [only before a noun] COMPUTING relating to a type of LOGIC in which something can be either true or false, but not bothonline systems which make use of Boolean logica Boolean search (=a search for information on a computer, using Boolean logic)
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