noun.
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noun.
The act of perturbing, or the state of being perturbed; disturbance; disorder; especially, disquiet of mind; restlessness or want of tranquillity of mind; commotion of the passions.
noun.
Variation; especially, irregular or violent variation.
noun.
A cause of disquiet.
noun.
In astronomy, a deviation of the motion of a planet or comet from a fixed orbit or from its regular velocity in that orbit.