|1.||a body mounted so that it can swing freely under the influence of gravity. It is either a bob hung on a light thread (simple pendulum) or a more complex structure (compound pendulum)|
|2.||such a device used to regulate a clockwork mechanism|
|3.||something that changes its position, attitude, etc fairly regularly: the pendulum of public opinion|
|[C17: from Latin pendulus|
|pendulum (pěn'jə-ləm) Pronunciation Key
A mass hung from a fixed support so that it is able to swing freely under the influence of gravity. Since the motion of pendulums is regular and periodic, they are often used to regulate the action of various devices, especially clocks.