Topic sentence

By the grammar of a language is meant either the relations born by the words of a sentence and by sentences themselves one to another, or the systematized exposition of these.

—Topic sentence of the Grammar article, Encyclopædia Britannica 1911 Edition

The topic sentence is a prescriptive grammatical term to describe the sentence in an expository paragraph which summarizes the main idea of that paragraph.[1][2] It is usually the first sentence in a paragraph. The topic sentence acts as a kind of summary, and offers the reader an insightful view of the writer’s main ideas for the following paragraph.[3] More than just being a mere summary, however, a topic sentence often provides a claim or an insight directly or indirectly related to the thesis. It adds cohesion to a paper and helps organize ideas both within the paragraph and the whole body of work at large.[4][5][6]

Its use is considered standard in the American educational system and most venues of writing mainly because it increases reading accessibility.

A topic sentence (also known as a focus sentence in some cases) encapsulates or organizes an entire paragraph. Although topic sentences may appear anywhere in a paragraph, in academic essays they often appear at the beginning.[2]

Last modified on 22 April 2013, at 00:23