Final answer:
A paragraph is a group of sentences that centers around a central idea, serving as a unit of thought in writing. The central idea is usually stated in a topic sentence.
Step-by-step explanation:
A paragraph is defined as a group of sentences that centers around a central idea. It serves as a unit of thought in writing and helps to organize and develop ideas in a coherent manner. The central idea is usually stated in a topic sentence, which is supported by details, examples, or evidence.
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