kaksisuuntaiseen

Kaksisuuntaiseen is the illative singular form of the Finnish adjective kaksisuuntainen, which means "bidirectional" or "two-way." As an inflected form, kaksisuuntaiseen is used to indicate movement into, transition to, or orientation toward something that is bidirectional (for example, "into two-way traffic" or "into bidirectional communication").

Morphologically, the base kaksisuuntainen derives from kaksi ("two") + suunta ("direction") + the adjectival suffix -inen. In the common Finnish -nen adjective declension, the illative singular is formed by replacing -nen with -seen, producing kaksisuuntaiseen. This form agrees in case and number with the noun it modifies and is used in contexts that require the illative.

Kaksisuuntaiseen appears in technical and everyday contexts where a two-way property or movement is relevant: traffic engineering (kaksisuuntaiseen liikenteeseen), telecommunications and networking (kaksisuuntaiseen viestintään), electronics (kaksisuuntaiseen porttiin), and figurative uses concerning reciprocal relations. Because it is a case form rather than a citation form, it typically appears only within sentences and phrases.

Examples:

- "Auto siirtyi kaksisuuntaiseen liikenteeseen." (The car moved into two-way traffic.)

- "Järjestelmä on suunniteltu kaksisuuntaiseen viestintään." (The system is designed for bidirectional communication.)