The musical term alto, meaning high in Italian (Latin: altus), refers to the second highest part of a contrapuntal musical texture and is also applied to its associated vocal range, especially in choral music. It is also the root word of contralto, the lowest standard female voice type.
circle noun [ C ] (SHAPE) âº geometry a continuous curved line which is always the same distance away from a fixed central point, or the area enclosed by such a line: Colored paper was cut into circles, squares, and triangles. A circle of chairs had been arranged in the center of the room.
In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is the length of any of them. The name comes from Latin radius, meaning ray but also the spoke of a chariot wheel.