lib-ration

li·bra·tion

[lahy-brey-shuhn]
noun Astronomy.
a real or apparent oscillatory motion, especially of the moon.

Origin:
1595–1605; < Latin lībrātiōn- (stem of lībrātiō) a balancing. See librate, -ion

li·bra·tion·al, adjective
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libration (laɪˈbreɪʃən) [Click for IPA pronunciation guide]
 
n
1.  the act or an instance of oscillating
2.  a real or apparent oscillation of the moon enabling approximately 59 per cent of the surface to be visible from the earth over a period of time
 
[C17: from Latin librātus, from librāre to balance]
 
li'brational
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Lib-ration is always a great word to know.
So is callithumpian. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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