The term for the lowest note in a triad is called the root. To understand this, let's break down what a triad is. A triad is a three-note chord consisting of a root note, a third, and a fifth. The root note is what gives the chord its name and serves as the foundation. So, in a triad, the lowest note is always the root. Therefore, the correct answer is "root."
The term for the lowest note in a triad is the root.
