The audience's perception of the speaker's qualification to speak on a topic is called credibility.
In the field of English linguistics, credibility refers to the authenticity of something.
Credibility determined whether something that is spoken or written is correct or not.
When an audience judges or makes a perception about a speaker's knowledge of the topic he is speaking about, the audience is judging the credibility of the speaker on that particular topic. If the credibility is considered positive then this means that the speaker has a good amount of knowledge for the topic.
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