Etymology
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perturb (v.)

late 14c., perturben, "disturb greatly, disturb mentally; cause disorder in," from Old French perturber "disturb, confuse" (14c.) and directly from Latin perturbare "to confuse, disorder, disturb," especially of states of the mind, from per "through" (from PIE root *per- (1) "forward," hence "through") + turbare "disturb, confuse," from turba "turmoil, crowd" (see turbid). Related: Perturbed; perturbing.

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Definitions of perturb

perturb (v.)
disturb in mind or make uneasy or cause to be worried or alarmed;
She was rather perturbed by the news that her father was seriously ill
perturb (v.)
disturb or interfere with the usual path of an electron or atom;
The electrons were perturbed by the passing ion
perturb (v.)
cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull;
The orbits of these stars were perturbed by the passings of a comet
perturb (v.)
throw into great confusion or disorder;
Fundamentalists threaten to perturb the social order
Synonyms: derange / throw out of kilter
From wordnet.princeton.edu