A copulative word is a term that joins or links elements in parallel or coordinate relationships, typically functioning as a conjunction that connects words, phrases, or clauses of equal grammatical status. In poetry, copulative words create accumulative effects, establish rhythmic patterns through repetition, or build intensity through the addition of parallel elements. The most common copulative word "and" can generate various effects from simple listing to hypnotic incantation, depending on context and frequency, making these seemingly simple connectors powerful tools for structural organization.

A copulative word joins elements to show equivalence or addition (e.g., "is," "and")—in poetry, often minimized to create ambiguity or open-endedness.