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Poetic Device · Reference

Assonance

A move poets keep coming back to.

What is assonance in poetry? This question often pops up when you notice a line has a musical quality, but you can't quite put your finger on why rhyme alone doesn't explain it all.

Definition

Assonance refers to the repetition of the same or similar vowel sounds in nearby words, typically found within the same line or across a couple of lines. The consonants surrounding those vowels can differ completely — that's how assonance stands apart from rhyme. For example, "slow" and "road" share that long o sound; they demonstrate assonance, but they don't rhyme.

Poets often employ assonance because vowel sounds carry an emotional weight that's tough to define yet easy to feel. Long, open vowels — like oh, ah, oo — tend to slow down a line and lend it a mournful or expansive quality. In contrast, short, clipped vowels — such as ih, eh, uh — can create a sense of tension or urgency. By weaving the same vowel sound throughout a passage, a poet crafts a kind of sonic glue: the words seem to belong together even if their meanings are diverging.

The effect of assonance is subtler than that of end rhyme. Readers often don't consciously notice it, which is part of its charm. It influences you similarly to how a key change affects music — you sense the shift before you fully grasp it. This subconscious effect is why assonance appears in everything from ancient oral epics to modern free verse. It's a timeless tool, and it continues to resonate.

Annotated examples

From the corpus · I to II.
  1. I.from the corpus

    Once upon a midnight dreary, while I pondered, weak and weary,

    Why this works

    The extended ee sound ties the line together: dreary, weak, weary. These aren't traditional end rhymes — they occur in the middle and at the end, enveloping the entire line in a similar mournful tone. The repeated vowel echoes the narrator's tired, repetitive thoughts. You sense the fatigue even before grasping the words' meaning. Poe employs this assonance to establish the poem's emotional tone right from the first line.

    from The Raven by Edgar Allan Poe
  2. II.from the corpus

    The only other sound's the sweep Of easy wind and downy flake.

    Why this works

    The long ee sound flows through sweep, and the near-echo in flake transitions to the gentle oh in downy. These open vowels slow the reader's pace, mirroring the quiet of a snowfall. Frost is doing something intentional here: the assonance doesn’t merely embellish the scene; it creates it. When you read the lines aloud, your mouth opens and relaxes, allowing the silence of the woods to seep in through the poem’s sound.

    from Stopping by Woods on a Snowy Evening by Robert Frost

Reader’s guide

How to spot assonance

Assonance often hides in plain sight, so it’s important to listen as much as read. Here’s a handy checklist:

  1. Read the lines aloud. Assonance is a sound device — your ear can catch a pattern that your eye might miss.
  2. Isolate the stressed vowels. Highlight the vowel sound in each stressed syllable. If the same sound repeats two or more times nearby, that’s assonance.
  3. Check that the consonants are different. If the ending consonants match as well, you have rhyme (or near-rhyme). Assonance only needs the vowel to repeat.
  4. Look for words inside the line, not just at the ends. End rhymes are easy to spot; assonance often appears in the middle of a line where it’s less noticeable.
  5. Notice the emotional tone. Long vowels (oh, oo, ah) often suggest slowness, grief, or awe. Short vowels (ih, eh, uh) typically indicate tension or speed. If the mood of a passage feels unusually consistent, assonance might be at play.
  6. Watch for clusters. Three or more words sharing a vowel sound in a short section is a strong indication that the poet made a deliberate choice.

Writer’s guide

How to write with assonance

Here are three practical ways to apply assonance in your own poems:

  1. Select a vowel that aligns with your emotional intent, then craft your word choices around it. For a line that feels heavy and slow, opt for long o or oo words. If you want to create a sense of urgency, use short i or e words. For example: The moon loomed low over the cold stone road.
  1. Employ assonance to connect two seemingly unrelated images. Weaving the same vowel through two different nouns establishes a subtle relationship between them. For instance: The bride's white veil, the knife's bright gleam — both caught the light.
  1. Alter the vowel sound between stanzas to indicate a change in tone. Start one stanza with long ah sounds and transition to short ih sounds in the following one. While the reader may not consciously notice the shift, the emotional atmosphere will change. For example: She called across the dark, calm lake — / then slipped, and the ship's rigging snapped and split.

Poems that turn on assonance

From the public-domain corpus

Adjacent in Sound & music

Open the collection →

Postscript

Frequent definitions