Yksisuuntaisen

Yksisuuntaisen is the genitive singular form of the Finnish adjective yksisuuntainen, which means one-directional or unidirectional. The base form yksisuuntainen is used to describe something that proceeds in a single direction, such as a traffic pattern, a signal, or a flow.

Etymology and grammar: the word is built from the stem yksisuunti- derived from yksi (one) and suunta (direction) with the common Finnish suffix -inen. As an attributive adjective, yksisuuntainen agrees with the noun it modifies in number and case. The corresponding forms include yksisuuntaiset (nominative plural), yksisuuntaisen (genitive singular), and yksisuuntaisten (genitive plural), among others. The form yksisuuntaisen specifically appears when the noun it describes is in genitive singular, for example yksisuuntaisen kadun liikenne (the traffic of a one-way street).

Usage: the term is widely used in road traffic regulation to describe one-way streets, lanes, or movements, such as yksisuuntainen katu or yksisuuntaisen liikenteen järjestely. It also appears in technical and scientific contexts to denote unidirectional phenomena, for example yksisuuntaista sähkövirtaa or yksisuuntaisen virran suunta. In everyday Finnish, it remains a neutral descriptor without connotations beyond directionality.

See also: kaksisuuntainen (two-way), monisuuntaisuus (multidirectionality), liikenne (traffic), suunta (direction).

In summary, yksisuuntaisen is a grammatically specific form of an adjective that denotes unidirectionality, mainly used in traffic and technical contexts, with a full set of inflected forms to fit Finnish grammar.