Asyndeton is the deliberate omission of conjunctions such as and, or, or but between words, phrases, or clauses. In poetry, it can speed up the rhythm, sharpen the impact of a list, or make language feel compressed and forceful.
It is the opposite of polysyndeton, which repeats conjunctions between elements.
Compare with polysyndeton.
Example
Wind, rain, thunder, night.
The road, the dark, the long return.