A lyrical movement or piece for solo voice with instrumental accompaniment is called a?

The term you are looking for is "aria". An aria is a lyrical composition for a solo voice with instrumental accompaniment, typically found in operas, oratorios, and cantatas. Arias are often elaborate and expressive, showcasing the singer's vocal abilities and conveying emotions or advancing the narrative of the work. Arias come in various forms, and they can be classified based on their musical structure, such as da capo aria, strophic aria, or free aria.