Etymology
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perturbation (n.)

late 14c., perturbacioun, "mental disturbance, state of being perturbed," from Old French perturbacion "disturbance, confusion" (14c.) and directly from Latin perturbationem (nominative perturbatio) "confusion, disorder, disturbance," noun of action from past participle stem of perturbare (see perturb).

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Definitions of perturbation

perturbation (n.)
an unhappy and worried mental state;
Synonyms: disturbance / upset
perturbation (n.)
(physics) a secondary influence on a system that causes it to deviate slightly;
perturbation (n.)
activity that is a malfunction, intrusion, or interruption;
the term `distress' connotes some degree of perturbation and emotional upset
Synonyms: disturbance
perturbation (n.)
a disposition that is confused or nervous and upset;
Synonyms: fluster
perturbation (n.)
the act of causing disorder;
Synonyms: disruption
From wordnet.princeton.edu