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Period (rhetoric)


A periodic sentence is a stylistic device employed at the sentence level, described as one that is not complete grammatically or semantically before the final clause or phrase.

The periodic sentence emphasizes its main idea by placing it at the end, following all the subordinate clauses and other modifiers that support the principal idea. The sentence unfolds gradually, so that the thought contained in the subject/verb group only emerges at the sentence's conclusion. Obviously artificial, it is used mostly in what in oratory is called the grand style.

It is the opposite of the loose sentence, also continuous or running style, where the subject and verb are introduced at the beginning of the sentence. Periodic sentences often rely on hypotaxis, whereas running sentences are typified by parataxis.

Cicero is generally considered to be the master of the periodic sentence.

In English literature, the decline of the periodic sentence's popularity goes hand in hand with the development toward a less formal style, which some authors date to the beginning of the Romantic period, specifically the 1798 publication of the Lyrical Ballads, and the prevalence in twentieth-century literature of spoken language over written language. In American literature, scholars note the explicit rejection by Henry David Thoreau of the formal style of his time, of which the periodic sentence was characteristic; in his journal, Thoreau criticized those sentences as the "weak and flowing periods of the politician and scholar."

According to William Harmon, the periodic sentence is used "to arouse interest and curiosity, to hold an idea in suspense before its final revelation." In the words of William Minto, "the effect...is to keep the mind in a state of uniform or increasing tension until the dénouement."

In his Handbook to Literature, Harmon offers an early example in American literature found in Longfellow’s "Snowflakes":


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