perturbation
transitive-verb
To worry or disturb someone.
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Don't let the noise perturbation your work.
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The rumors of the company's financial troubles perturbed many employees.
To cause a system, such as an orbit or a fluid, to deviate from its expected path or state.
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Gravity from other planets can perturbation the asteroid's path.
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The unexpected pressure changes perturbed the flow of the liquid in the pipe.