Source : Free On-Line Dictionary of Computing

Boolean search
     
         (Or "Boolean query") A query using the
        {Boolean} operators, {AND}, {OR}, and {NOT}, and parentheses
        to construct a complex condition from simpler criteria.  A
        typical example is searching for combinatons of keywords on a
        {World-Wide Web} {search engine}.
     
        Examples:
     
        	car or automobile
     
        	"New York" and not "New York state"
     
        The term is sometimes stretched to include searches using
        other operators, e.g. "near".
     
        Not to be confused with {binary search}.
     
        See also: {weighted search}.
     
        (1999-10-23)