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topic sentence

or topical sentence

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noun
a sentence that expresses the essential idea of a paragraph or larger section, usually appearing at the beginning.
QUIZ
ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
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Origin of topic sentence

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use topic sentence in a sentence

British Dictionary definitions for topic sentence

topic sentence

noun
a sentence in a paragraph that expresses the main idea or point of the whole paragraph
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for topic sentence

topic sentence

The main sentence in a paragraph, often the first sentence. It briefly conveys the essential idea of the paragraph.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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