What can be defined as a statement by a credible person (source) that lends weight and authority to the speaker's presentation?

Name: What can be defined as a statement by a credible person (source) that lends weight and authority to the speaker's presentation?
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Question

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Testimony is a statement made by a credible person, such as an expert or witness, that can add credibility and authority to a speaker's presentation. It can be used to support arguments or provide evidence for a particular point.

What Can Be Defined as a Statement by a Credible