The definition of delinquent is something improper or criminal in nature or something that is late in being done. An example of delinquent behavior is robbing a store. An example of delinquent is a credit card payment that should have been paid several months earlier.
Fire hydrant meters are a specialized type of portable turbine meter attached to a fire hydrant to measure water flowing out of the hydrant. The meters are normally made of aluminium to keep their weight low and usually have a 3 capacity.
The system by which multi-unit buildings or mobile home parks are connected to a single meter. Source : http://www.utilityami.org/docs/Utility%20AMI%20Glossary_Compiled_041306.xls. link: http://www.utilityami.org/. Second source: CEC Glossary Web site.