Definition
In standard English punctuation, you would write: "I bought apples, oranges, and pears." With polysyndeton, it becomes: "I bought apples and oranges and pears." That additional "and" isn't a grammatical error; it’s a deliberate choice that transforms the emotional impact of the line.
The effect can vary based on the context, but two things usually happen. First, the rhythm slows down. Each conjunction acts as a brief pause, a beat, which forces the reader to pause on every item before moving to the next. Second, the list appears open-ended, even infinite. A typical list signals its conclusion with the final comma followed by the conjunction, letting readers know the end is near. Polysyndeton eliminates that cue, suggesting that the series could continue indefinitely. This sense of accumulation — of things stacking up without pause — is precisely what poets aim for when they want to convey feelings of being overwhelmed, abundant, or relentless.
Polysyndeton appears in ecstatic catalogues (Walt Whitman is a master of this), in expressions of grief, in prayers, and in any situation where a poet wants the reader to appreciate the weight of each individual item instead of allowing the list to blend into a single impression.