perturbation meaning and definition

PERTURBATION noun

Definition of perturbation (noun)

1. an unhappy and worried mental state
   • "there was too much anger and disturbance"; "she didn't realize the upset she caused me"
   • synonyms: disturbance, upset
2. (physics) a secondary influence on a system that causes it to deviate slightly
3. 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"
   • synonyms: disturbance
4. a disposition that is confused or nervous and upset
   • synonyms: fluster
5. the act of causing disorder
   • synonyms: disruption