What term describes the highness or lowness of a sound?

The term that describes the highness or lowness of a sound is "pitch." Pitch is a fundamental characteristic of sound that relates to the frequency of sound waves; higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. This concept is essential for understanding music and how different notes are perceived in relation to one another.

Dynamics refers to the volume of sound (how loud or soft it is), tempo relates to the speed of the music or the pace at which it is performed, and volume indicates the intensity or amplitude of the sound. While all these elements are crucial in music, they do not specifically address the concept of highness or lowness in sound, which is exclusively defined by pitch.