perturbation

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per|tur|ba|tion /p'ɜːrtərb'eɪʃən/ (perturbations)
1 [N-VAR]
A perturbation is a small change in the movement, quality, or behaviour of something, especially an unusual change. (TECHNICAL)
...perturbations in Jupiter's gravitational field.
2 [N-UNCOUNT]
Perturbation is worry caused by some event. (FORMAL)
This message caused perturbation in the Middle East Headquarters.
= alarm

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