vahvistaminen[Finnois]

nom
1 : the act of proving that an instrument purporting to be a will was signed and executed in accord with legal requirements
2 : a judgment by a higher court that the judgment of a lower court was correct and should stand
3 : the cognitive process of establishing a valid proof
4 : the act of increasing the strength of something
5 : a statement asserting the existence or the truth of something