Piirjoone

Piirjoone is the genitive form of the Estonian noun piirjoon, a term that denotes a boundary line or border line. The base word piirjoon is a compound built from piir meaning border or boundary and joon meaning line. In standard Estonian, piirjoone functions as the possessive form used in phrases such as “riigi piirjoone” (the state’s boundary line) or “maa piirjoone pikkus” (the length of the land boundary line).

Usage and context

Piirjoone is primarily used in geographic, cartographic, surveying, legal, and planning contexts. It appears in maps, property descriptions, and official regulations to refer to a line that marks the limit of a defined area, such as a country, municipality, land parcel, or administrative zone. In descriptive prose, piirjoone can be combined with other terms to specify particular aspects of a boundary, for example the determination, measurement, or delineation of a boundary line.

Relation to related terms

Piirjoon refers to the boundary line itself, while piir indicates the border or boundary concept more generally, and joon denotes a line. The term is most common in Estonian-language materials related to borders, land surveys, or legal descriptions of limits. In mathematical or geometric contexts, the broader word joon or the phrase piirjoone (in its genitive form) may appear depending on sentence structure.

See also

piir, joon, piirjoon, piirjoonega seotud terminid.