1. sister city; twin town
Wikipedia definition
2. Twin towns and sister citiesTwin towns and sister cities are two of many terms used to describe the cooperative agreements between towns, cities, and even counties in geographically and politically distinct areas to promote cultural and commercial ties.
Read “Twin towns and sister cities” on English Wikipedia
Read “姉妹都市” on Japanese Wikipedia
Read “Twin towns and sister cities” on DBpedia


to talk about this word.