witness (suomeksi)

todistaminen (s)
todistaja (s: one who has a personal knowledge of something / someone called to give evidence in a court)
todistus (s: attestation of a fact or event)
todiste (s: something that serves as evidence)
todistaa (v: (transitive) to furnish proof of / (transitive) to take as evidence / (transitive) to see or gain knowledge of through experience / (intransitive) to preach presenting personal testimony)
osoittaa (v: (transitive) to take as evidence)