Dictionary
Find
in
Dictionary
Thesaurus
Translations

Click to move up the list of words
Libra
librarian
library
library edition
Library of Congress
library paste
library science
library shot
libration
libretti
librettist
libretto
Libreville
Libya
Libyan Desert
lice
licence plate
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

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
Advertisement

© 2009 Microsoft