Lib ration

libration

[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

librational, adjective
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World English Dictionary
libration (laɪˈbreɪʃən)
 
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

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