A raion (or rayon) is a type of administrative unit of several post-Soviet countries. The term, which is from French rayon 'honeycomb, department,' describes both a type of a subnational entity and a division of a city, and is commonly translated in English as "district". Raion also can be used simply as a second degree of administrative division without anything to do with ethnicity or nationality. A raion is usually an administrative entity two steps below the national level, however in smaller countries it could be the primary level of administrative division.
Raion (or rayon) is райо́н in Russian and Ukrainian.