What do we call it when a paragraph's sentences all relate to a single key idea?

The term used to describe when all sentences in a paragraph relate to a single key idea is unity. Unity ensures that the paragraph maintains a clear focus, making it easier for the reader to follow and understand the main point being conveyed. When a paragraph exhibits unity, each sentence contributes to developing the central theme, providing support or detail that reinforces that main idea.

This clarity helps prevent confusion and allows readers to grasp the intended message without distraction from unrelated concepts. In contrast, coherence refers to the logical flow and connection between sentences and ideas, while configuration pertains more to the structural arrangement of elements rather than the thematic focus. Repetition involves restating the same ideas or phrases, which does not inherently guarantee that all sentences in a paragraph are centered around a single key idea. Thus, unity is the most accurate term for this concept.