Which term best describes poetry that uses rhythm without a set meter?

The term "free verse" accurately describes poetry that employs rhythm without adhering to a specific meter. This style of poetry allows for a natural flow and varying line lengths, giving the poet the freedom to express their thoughts and emotions without the constraints of traditional metrical patterns. Free verse can include a variety of rhythmic patterns, but it does not stick to a fixed form, making it distinct from structured forms like iambic pentameter or sonnets, which have strict rules regarding rhythm and rhyme. By utilizing free verse, poets can focus more on the content and imagery of their work rather than conforming to a predetermined structure. This flexibility is what defines free verse poetry, distinguishing it from other forms listed in the options.