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Dictionary

per•turb

Pronunciation: (pur-tûrb'), [key]
—v.t.
1. to disturb or disquiet greatly in mind; agitate.
2. to throw into great disorder; derange.
3. Astron.to cause perturbation in the orbit of (a celestial body).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

pertinent

perturbation

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