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• Libration (molecule)

  Libration (from the Latin verb librare "to balance, to sway"; cf. libra "scales") is a type of reciprocating motion in which an object with a nearly fixed orientation repeatedly rotates slightly back and forth. In physics and chemistry, a molecule (or other group of atoms ) can undergo libration if it is subject to external forces or constraints that restrict its orientation.

• Socialist Ethiopian Libration Army