How is 'diction' defined in literature?

Diction refers specifically to the choice and use of words and phrases in speech or writing. This element of language is crucial because it reflects the author’s style and conveys meaning in specific contexts. Diction can vary greatly depending on the audience, purpose, and genre, influencing the tone and clarity of the message. For instance, an author might use formal diction in an academic paper to convey seriousness and authority, while employing colloquial diction in a novel to create a relatable and informal atmosphere.

In this context, the other definitions do not align with the standard understanding of diction. The structure of sentences pertains to syntax rather than diction. The emotional tone in dialogue is more closely related to mood or tone rather than the selection of specific words. Lastly, the rhythm and flow of narrative prose relates to the overall composition and style of writing, distinct from the word choices that constitute diction. Thus, the definition provided in the correct answer aligns perfectly with the literary concept of diction.