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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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I think there is one higher office than president and I would call that patriot. - Click here to find out.
Fact of the day
Another word to refer to old age is senectitude.