Pendulum (noun)

1. A weight suspended from a fixed point so that it can swing freely back and forth.
2. A device that consists of a weight suspended from a fixed point that swings back and forth and is used to regulate time in clocks.

Origin:

From the latin word 'pendulum' meaning 'a hanging weight'.

Examples:

1. The pendulum of the grandfather clock swayed back and forth with a steady rhythm.
2. The pendulum was used to measure time and keep the clock accurate.
3. The pendulum was an essential component of the clock and was responsible for its accuracy.
4. The pendulum was made of brass and was carefully weighted to ensure its accuracy.
5. The pendulum was a marvel of engineering and helped revolutionize timekeeping in the 16th century.