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pen·du·lum  (pnj-lm, pndy-, pnd-)
1. A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices, especially clocks. Also called simple pendulum.
2. Something that swings back and forth from one course, opinion, or condition to another: the pendulum of public opinion.

[New Latin, probably from Italian pendolo, pendulous, pendulum, from Latin pendulus, hanging; see pendulous.]

pendulum [ˈpɛndjʊləm]
1. (Physics / General Physics) 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. (Miscellaneous Technologies / Horology) such a device used to regulate a clockwork mechanism
3. something that changes its position, attitude, etc. fairly regularly the pendulum of public opinion
[from Latin pendulus pendulous]

pendulum  (pnj-lm)
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.

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