1. Evidence given by a competent witness under oath or affirmation in a court of law; as distinguished from evidence derived from writings, and other sources.
2. Something that supports a fact or a claim.
3. A public profession of Christian faith or religious experience.

It is stated that under Roman law no man was admissible as a witness unless there was evidence or “witnesses” of one’s virility because only verified men were allowed to give witness, or to testify, in legal matters.

In common legal parlance, testimony and "evidence" are synonymous.

Testimony properly means only such evidence as is delivered by a witness on the trial of a cause either orally or in the form of affidavits or depositions.

Any testimony of expert scientific, engineering, economic or of any other specialized nature used to assist the court and the lawyers in a lawsuit or prosecution.