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A
element is a descriptive word, phrase, or clause that is not essential to the meaning of a sentence.

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Answered by GPT-5 mini AI
The term is a nonessential element (also called a nonrestrictive or parenthetical element).

A nonessential element is a descriptive word, phrase, or clause that can be removed without changing the basic meaning of the sentence. It is usually set off with commas, dashes, or parentheses.

Examples:
- My sister, an excellent cook, made dinner. ("an excellent cook" is nonessential)
- The books that are on the shelf belong to Sam. (restrictive — essential)
- The books, which are on the shelf, belong to Sam. (nonrestrictive — extra information)

Rule of thumb: if you can remove the phrase and the sentence still makes sense and refers to the same people/things, it’s nonessential and should be punctuated accordingly.