In rhetoric, chiasmus or, less commonly, chiasm (Latin term from Greek χίασμα, "crossing", from the Greek χιάζω, chiázō, "to shape like the letter Χ") is a "reversal of grammatical structures in successive phrases or clauses – but no repetition of words". Chiasmus should not be confused with a subtype of this scheme, antimetabole, which also involves a reversal of grammatical structures in successive phrases or clauses, but unlike chiasmus, presents a repetition of words in an A-B-B-A configuration.
Examples of chiasmus and its subtype antimetabole
Chiasmus balances words or phrases with similar, though not identical, meanings:
"Dotes" and "strongly loves" share the same meaning and bracket "doubts" and "suspects".
Additional examples of chiasmus:
For comparison, the following is considered antimetabole, in which the reversal in structure involves the same words:
Here is the structure of antimetabole presented in table form:
Both chiasmus and antimetabole can be used to reinforce antithesis. In chiasmus, the clauses display inverted parallelism. Chiasmus was particularly popular in the literature of the ancient world, including Hebrew, Greek, and Latin, where it was used to articulate the balance of order within the text. For example, many long and complex chiasmi have been found in Shakespeare and the Greek and Hebrew texts of the Bible. It is also found throughout the Quran  and the Book of Mormon. 
Chiasmus can be used in the structure of entire passages to parallel concepts or ideas. This process, termed "conceptual chiasmus", uses a criss-crossing rhetorical structure to cause an overlapping of "intellectual space". Conceptual chiasmus utilizes specific linguistic choices, often metaphors, to create a connection between two differing disciplines. By employing a chiastic structure to a single presented concept, rhetors encourage one area of thought to consider an opposing area's perspective.
Effectiveness of chiasmus
Chiasmus derives its effectiveness from its symmetrical structure. The structural symmetry of the chiasmus imposes the impression upon the reader or listener that the entire argument has been accounted for. In other words, chiasmus creates only two sides of an argument or idea for the listener to consider, and then leads the listener to favor one side of the argument. In former President John F. Kennedy's famous quote, "ask not what your country can do for you; ask what you can do for your country", the only two questions that the chiastic statement allows for are whether the listener should ask what the country can do for him, or ask what he can do for his country. The statement also proposes that the latter statement is more favorable. Thus, chiasmus gains its rhetorical efficacy through symmetrical structure causing the belief that all tenets of an argument have been evaluated.
The Wilhelmus, the national anthem of the Netherlands, has a structure composed around a thematic chiasmus: the 15 stanzas of the text are symmetrical, in that verses one and 15 resemble one another in meaning, as do verses two and 14, three and 13, etc., until they converge in the eighth verse, the heart of the song. Written in the 16th century, the Wilhelmus originated in the nation's struggle to achieve independence. It tells of the Father of the Nation William of Orange who was stadholder in the Netherlands under the king of Spain. In the first person, as if quoting himself, William speaks to the Dutch people and tells about both the outer conflict – the Dutch Revolt – as well as his own, inner struggle: on one hand, he tries to be faithful to the king of Spain, on the other hand he is above all faithful to his conscience: to serve God and the Dutch people. This is made apparent in the central 8th stanza: "Oh David, thou soughtest shelter from King Saul's tyranny. Even so I fled this welter". Here the comparison is made between the biblical David and William of Orange as merciful and just leaders who both serve under tyrannic kings. As the merciful David defeats the unjust Saul and is rewarded by God with the kingdom of Israel, so too, with the help of God, will William be rewarded a kingdom; being either or both the Netherlands, and the kingdom of God.
- Arch form
- Chiastic structure
- Figure of speech
- Golden line (a Latin poetic line based on an abAB structure)
- Russian reversal
- Silver line (a Latin poetic line based on an abBA structure)
- Synchysis (the reverse of the chiasmus)
- The Throne Verse
- Transpositional pun
- Corbett and Connors, 1999. p. 58-59, 74
- Baldick,2008. p. 17
- Corbett and Connors, 1999. p. 63
- Baldick,2008. p.52-53
- Baldick,2008. p.52
- Corbett and Connors, 1999. p. 59
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