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perturbation
'perturbation' - used as a noun
1. an unhappy and worried mental state
2. (physics) a secondary influence on a system that causes it to deviate slightly
3. activity that is an intrusion or interruption
4. a disposition that is confused or nervous and upset
5. the act of causing disorder
Variations of 'perturbation'
 
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The trunk of an elephant can hold up to two gallons of water.