Chiasmus is a rhetorical figure in which two corresponding pairs of words are arranged in inverted (a-b-b-a) order rather than the expected parallel order, creating emphasis by pulling the reader's attention to that point in the line.
Chiasmus is a word-order device where two matching pairs get flipped. Instead of the parallel pattern a-b-a-b, you get a-b-b-a. Picture an adjective, then a second adjective, then the noun that goes with the second adjective, then the noun that goes with the first. The pattern folds back on itself like a mirror, and the name comes from the Greek letter chi (X), because if you draw lines connecting each adjective to its noun, they cross.
The CED defines it precisely: chiasmus is "a rhetorical figure in which two corresponding pairs are arranged not following a regular order but in inverted order (a-b-b-a)." The why matters as much as the what. Chiasmus creates emphasis. Because Latin uses case endings instead of word order to show grammar, Vergil is free to scramble word order for effect, and a chiastic arrangement makes the reader slow down and notice the framed words. Often the two outer terms enclose the inner ones in a way that mirrors the meaning, like a pair of enemies physically surrounding the words between them.
Chiasmus appears in the essential knowledge for two learning objectives: AP Latin 4.2.F (Aeneid Book 1, the storm and Dido passages) and AP Latin 5.1.G (Aeneid Book 4, Dido and Aeneas's relationship and the rumor of it). Both LOs ask you to "describe the use of word order as a stylistic device in Latin texts." That phrasing is the whole game. It's not enough to spot the a-b-b-a pattern; you have to say what the inverted order does, which the CED tells you directly: it creates emphasis and calls attention to that point. Word order analysis is one of the core analytical skills running through Units 4 and 5, and it feeds straight into the analytical essay, where you connect stylistic choices in the Latin to an argument about meaning.
Keep studying AP Latin Unit 6
Anaphora (Unit 4)
Anaphora is the other named stylistic device in topic 4.2, but it works through repetition (the same word starting successive phrases) while chiasmus works through arrangement. Anaphora builds momentum; chiasmus builds a frame. Knowing which mechanism a device uses is exactly what device-identification questions test.
Dactylic Hexameter (Units 5-6)
Meter and word order are Vergil's two big structural tools, and they work together. A chiastic line still has to scan in dactylic hexameter, so when Vergil pulls off an a-b-b-a arrangement inside the meter's constraints, the emphasis is deliberate. Strong essay analysis often pairs a metrical observation with a word-order one.
Dido (Unit 5)
Topic 5.1 covers Book 4 lines on Dido and Aeneas, where Vergil's word-order artistry runs hot. Chiastic phrasing that physically intertwines or encloses words mirrors the entanglement of the two characters, a classic move to cite when you argue that form reinforces content.
Epic Elements (Unit 6)
Topic 6.14 treats the stylistic toolkit of epic as a whole. Chiasmus sits alongside simile, anaphora, and meter as one of the recurring features you should be able to spot in any sight or syllabus passage of Latin poetry, not just the lines where you first learned it.
Chiasmus shows up two ways. First, multiple-choice and short-answer questions can ask you to identify the figure of speech in a quoted line or to pick the line that contains a chiasmus, so you need to recognize the a-b-b-a shape fast (track which adjective agrees with which noun by case, gender, and number). Second, the analytical essay rewards using it as evidence. The winning formula is name the device, quote the Latin words in chiastic order, and explain the effect, which per the CED is emphasis that directs the reader's attention. "Vergil uses chiasmus" earns nothing by itself; "the chiastic arrangement of X and Y encloses Z, emphasizing..." earns points. No released FRQ is required to use the term verbatim for you to deploy it, and it's one of the safest devices to cite because the CED defines it explicitly.
Both are word-order figures involving two noun-adjective pairs, and they're the most-swapped pair in Latin class. Chiasmus is the mirrored pattern a-b-b-a, where the pairs fold inward. Synchysis is the interlocked pattern a-b-a-b, where the pairs alternate. Quick check: connect each adjective to its noun. If the lines cross like an X, it's chiasmus; if they run parallel, it's synchysis.
Chiasmus arranges two corresponding pairs in inverted a-b-b-a order instead of the expected parallel order.
The CED gives you its function for free: chiasmus creates emphasis by calling the reader's or listener's attention to that point.
It appears in the essential knowledge for AP Latin 4.2.F and AP Latin 5.1.G, both of which ask you to describe word order as a stylistic device.
To spot it, match adjectives to their nouns by case, gender, and number, then check whether the pairs mirror (chiasmus) or interlock (synchysis).
On the essay, citing chiasmus only scores when you quote the Latin words in their chiastic order and explain the effect on meaning.
Latin's case system makes chiasmus possible, since word order is freed up to do artistic work instead of grammatical work.
Chiasmus is a rhetorical figure in which two corresponding pairs of words are arranged in inverted a-b-b-a order rather than regular parallel order. The AP Latin CED names it under word-order stylistic devices in topics 4.2 and 5.1 and says its function is to create emphasis.
No. Chiasmus is the mirrored pattern a-b-b-a, while synchysis is the interlocked pattern a-b-a-b. Draw lines from each adjective to its noun; crossing lines (an X shape) mean chiasmus, parallel lines mean synchysis.
Use agreement, not position. Match each adjective to its noun by gender, number, and case, then check the order of the four words. If the first pair wraps around the second (adjective A, adjective B, noun B, noun A, or similar mirrored arrangements), you've got chiasmus.
No. Naming the device alone scores nothing on the analytical essay. You have to quote the specific Latin words in their chiastic order and explain the effect, such as emphasizing or enclosing a key idea, then tie that effect to your argument about the passage.
Anaphora is repetition (the same word or phrase starting successive clauses or lines, building momentum), while chiasmus is arrangement (inverting the order of two pairs to create emphasis). The CED treats anaphora as a repetition device (4.2.E) and chiasmus as a word-order device (4.2.F and 5.1.G).