Which term is a word or phrase that explain or define a noun? A. Appositive
B. Adverb
C. Modifier
D. Preposition

The word or phrase that aims to elaborate or define either a noun or noun phrase would be:

A). Appositive

'Appositive' is characterized itself as 'construction in which one noun or noun phrase is placed along with another equivalent that further elaborates it.'It is placed right beside the noun and both the noun and appositive play the same syntactic function in the sentence.For example,Sophie, a passionate girl, gathered all her hard work to win the painting competition.Here, the appositive i.e. the phrase 'a passionate girl' is elaborating the noun 'Sophie' in the sentence.

Learn more about 'appositive' here:

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D. Preposition

Explanation:

It's the only options that has to do with nouns and pronouns.

99, multiply all the sides