Tahdonalaisella

Tahdonalaisella is a Finnish adjective in the adessive case form used to describe actions or arrangements that are voluntary or based on the will and consent of the people involved. The term emphasises that participation or consent is given willingly rather than coerced.

Etymology: It derives from tahdon (will, consent) and the suffix -alainen, which forms adjectives meaning “belonging to” or “characteristic of.” The base adjective tahdonalainen means “voluntary” or “consensual.” The adessive singular tahdonalaisella literally means “with voluntary will/consent” or “on voluntary terms.”

Usage: The word is most common in formal, ethical, or legal contexts, such as research ethics, medical practice, or administrative language. It is used to describe acts performed with consent. Common collocations include tahdonalaisella suostumuksella (“with voluntary consent”) and tahdonalaisella osallistumisella (“with voluntary participation”).

Examples: Osallistuminen tutkimukseen tapahtui tahdonalaisella suostumuksella. Hoidon aloittaminen edellyttää tahdonalaisella suostumuksella tehtyä päätöstä.

See also: suostumus, vapaaehtoisuus, oikeudellinen kontekst, tieteellinen etiikka.