rejonu

Rejonu is the genitive singular form of the Polish noun rejon, which designates a region, district, or defined area. The noun rejon is a loanword in Polish, reflecting administrative and geographic concepts that originate in East Slavic languages, where the corresponding term rayon (Russian) or rayon (Ukrainian) denotes an administrative division. In Polish, rejon is used mainly in formal, historical, or translational contexts to reference a geographic or administrative unit rather than as a common everyday label.

Etymology and usage have shaped its current use. The Polish form rejon likely entered through contact with East Slavic administration and law, and the genitive form rejonu appears in phrases that require the genitive case. Common collocations include granice rejonu (the borders of the region), mapa rejonu (the map of the region), and obszar rejonu (the area of the region). The genitive ending signals possession or specification within a larger noun phrase.

Contemporary Polish usage generally relies on other terms for present-day administrative divisions, such as okręg (district or electoral district) or dzielnica (city district), depending on context. Rejon remains more common in historical writing, in translations of Ukrainian or Russian terms, and in geographic or legal descriptions that preserve East Slavic administrative concepts or in proper names that retain older usage. It also appears in discussions of regions influenced by East Slavic governance.

Related terms include rayon in Russian and Ukrainian, and okręg in Polish, reflecting overlapping notions of administrative districts across languages.