Libration Definition
lī-brāshən
noun
A very slow oscillation, real or apparent, of a satellite as viewed from the larger celestial body around which it revolves.
American Heritage
A slight, apparent rocking motion of the moon as seen from the earth, allowing approximately 59% of the moon's surface to be visible.
Webster's New World
The act of librating.
Wiktionary
(by extension) A similar rotational or orbital characteristic of some other celestial body.
Wiktionary
Other Word Forms of Libration
Noun
Singular:
libration
Plural:
librationsOrigin of Libration
Latin lībrātiō lībrātiōn- oscillation from lībrātus past participle of lībrāre to balance from lībra balance
From American Heritage Dictionary of the English Language, 5th Edition
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From Latin lÄ«brātiō (“a hurling, swinging"), from lÄ«brō (“poise, cause to swing").
From Wiktionary
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