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According to WordNet, the noun "perturbation" has 5 sense(s).
104904996 a disposition that is confused or nervous and upset.
107428450 activity that is a malfunction, intrusion, or interruption; "the term `distress' connotes some degree of perturbation and emotional upset"; "he looked around for the source of the disturbance"; "there was a disturbance of neural function".
100553173 the act of causing disorder.
114403282 an unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me".
111414874 (physics) a secondary influence on a system that causes it to deviate slightly.
SUMO Mappings: Physical (subsuming mapping)
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