Which term refers to a slow tempo in music?

The term that refers to a slow tempo in music is "lento." In musical terminology, "lento" indicates a speed that is slow, typically around 40 to 60 beats per minute. This term helps performers understand how to interpret the piece in terms of the pace at which it should be played. Slow tempos, like "lento," create a rich, expressive quality in music, allowing the performer to convey deeper emotions and provide more room for phrasing.

While "largo" also denotes a slow tempo, it is generally associated with a more expansive or broader approach than "lento." Therefore, both are considered slow tempos, but in the context of the question, "lento" is the most precise choice for conveying a slow tempo. "Hemiola" refers to a specific rhythmic pattern or syncopation, while "legato" refers to a style of playing where notes are connected smoothly without breaks, making them unrelated to the concept of tempo.