Which term refers to a tempo that is 'at a moderate speed'?

The term that refers to a tempo that is 'at a moderate speed' is "Moderato." In music, moderato is often used to indicate a tempo that is neither too fast nor too slow, allowing for a balanced and controlled performance. It typically suggests a speed that's somewhere around the middle of the tempo spectrum, making it suitable for many musical styles and forms.

Allegro, on the other hand, indicates a fast tempo, creating a lively and energetic feel, while Adagio denotes a slow tempo, emphasizing a more reflective and spacious interpretation of the music. Largo also represents a very slow tempo, often suggesting a broad and expansive character. Thus, Moderato stands out as the term that specifically describes a moderate speed within the context of tempo designations.