The term which gives your audience a literal explanation for key terms in your speech and can be especially helpful is "definition".
The term definition is a statement of the meaning of a word or group of words or a sign or symbol. It is used to describe, express or explain the essential nature of something.
Therefore, a definition gives your audience a literal explanation for key terms in your speech and can be especially helpful if those terms are unfamiliar to your audience or are being used in an unusual way.
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