"perturbation" in the noun sense
1. disturbance, perturbation, upset
an unhappy and worried mental state
"there was too much anger and disturbance"
"she didn't realize the upset she caused me"
2. perturbation
physics) a secondary influence on a system that causes it to deviate slightly
3. perturbation, disturbance
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"
4. perturbation, fluster
a disposition that is confused or nervous and upset
5. disruption, perturbation
the act of causing disorder
Source: WordNet® (An amazing lexical database of English)
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