Which term is defined as "very slow" in musical terminology?

The term that is defined as "very slow" in musical terminology is "Largo." This term is used to indicate a slow and broad tempo, often interpreted as a relaxed pace. In Western classical music, "Largo" sets a specific mood that can evoke feelings of grandeur and reflection, making it a common directive for composers when they wish to convey profound emotions or an expansive sound.

In contrast, the other terms listed have different meanings. "Leggiaro" typically indicates a light and delicate playing style, "Larghetto" refers to a moderately slow tempo, which is slightly faster than "Largo," and "Piano" pertains to a dynamic marking that instructs the musician to perform softly rather than indicating a tempo. This context helps clarify how "Largo" distinctly captures the sense of being "very slow" in the musical landscape.