Tahdonalainen

Tahdonalainen is a Finnish term used to describe a person or action characterized by voluntary consent. In legal, medical, and ethical discussions, it refers to decisions made with the individual's own will rather than under coercion or external pressure. The concept emphasizes autonomy and freedom of choice and is often contrasted with involuntary or coerced actions.

The word is formed from tahto (will, volition) in genitive tahdon plus alainen, a suffix meaning belonging to or characterized by. As a noun, tahdonalainen can refer to a person who acts according to their will; as an adjective, it modifies nouns to indicate voluntariness. In everyday Finnish, more common terms for similar meaning are vapaaehtoinen (voluntary) or suostuva (consenting).

Examples include tahdonalainen osallistuja (a voluntary participant), tahdonalainen lahjoittaja (a voluntary donor), and tahdonalainen suostumus (voluntary consent). The term is used when emphasizing that consent is given freely and knowingly, without coercion.

See also: suostumus, tahto, autonomia, vapaaehtoinen, eettinen harkinta.