Which term describes a compositional form with two sections, where the second section returns to material from the first?

The term that describes a compositional form with two sections, where the second section returns to material from the first, is known as rounded binary form. This form typically consists of an "A" section that presents a theme, followed by a "B" section that often contrasts with the first. The rounded aspect indicates that after the "B" section, there is a return to the original "A" material, making it a distinct characteristic of this form.

In rounded binary form, the return of the A material creates a sense of coherence and closure within the piece, while also allowing for contrast and development in the B section. This structure allows composers to explore musical ideas while ensuring that the initial theme is revisited, creating a satisfying sense of familiarity for the listener.

Other options listed do not fit this description. Ternary form consists of three sections, which includes an A-B-A structure rather than just a return to the A material without a contrasting section. Monophony refers to a single melodic line without harmonic accompaniment, and homophony involves a main melody supported by chordal accompaniment, both of which do not pertain to the double-section structure described in the question.