Rhyme Desk
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Definition of "Perturbation" :

noun: the act of causing disorder

noun: a disposition that is confused or nervous and upset

noun: activity that is a malfunction, intrusion, or interruption

"The term distress' connotes some degree of perturbation and emotional upset."

noun: (physics) a secondary influence on a system that causes it to deviate slightly

noun: an unhappy and worried mental state