Reunan

Reunan is the genitive singular form of the Finnish noun reuna, meaning edge, border, rim, or boundary. As a grammatical form, reunan is used to express possession or association with an edge, for example: laatan reunan muoto, meaning the shape of the edge of the tile, or rakennuksen reunan leveys, meaning the width of the building’s edge. In Finnish, genitive singular endings such as -n are common, and reunan appears frequently in descriptive phrases.

The base word reuna denotes a boundary or limit and is widely used in everyday language as well as technical discourse. Its exact historical etymology is not widely documented in general sources, but it sits among core Finnic terms for describing edges, rims, and margins. In addition to physical edges, reuna can be used figuratively to indicate limits or margins in data, plans, or discussions.

In usage, reunan combines with various nouns to specify which edge is meant, and it participates in a range of compound expressions such as reunan muoto (the shape of the edge), reunan pituus (the length of the edge), or reunan vaikutus (the edge’s impact). It appears across contexts including geography, design, architecture, manufacturing, and botany, where it may describe the leaf margin or other peripheral features, always conveying a sense of boundary or boundary-related characteristic.

See also: reuna, border, edge, margin.