libration.
The act of librating.
Meaning & usage
The act of librating.
The apparent wobble or variation in the visible side of the Moon that permanently faces the Earth, allowing observers on Earth to see, over a period of time, slightly more than half of the lunar surface.
A similar rotational or orbital characteristic of some other celestial body.
The oscillation of an angle about a stable equilibrium point.
A vibrational degree of freedom whereby a group of atoms partly rotates back and forth, similar to the Moon's motion.
A wavering between two opposing thoughts or choices.
Where this word comes from
From Latin lībrātiō (“a hurling, swinging”), from lībrō (“poise, cause to swing”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.