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libration
li·bra·tion [ lī bráysh'n ] (plural li·bra·tions)


noun 
Definition:
 
oscillation of orbit: a real or apparent oscillation in the orbit of one astronomical object as seen from the one around which it orbits, especially as seen in the Moon from Earth
[Early 17th century. < Latin libration-< librare "to balance" < libra "balance, scales"]

li·brate [ lī bráyt ] intransitive verb
li·bra·tion·al adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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