Englishfor English speakers
perturbation
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noun
(= disturbance, upset)
an unhappy and worried mental state
there was too much anger and disturbance
she didn't realize the upset she caused me
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noun
(physics) a secondary influence on a system that causes it to deviate slightly
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noun
a disposition that is confused or nervous and upset
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noun
(= 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
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noun
(= disruption)
the act of causing disorder
operator
Noun
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An operator is a person who operates something.
Jo is the operator of the tractor.
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An operator is a person who works on making connections for people over the telephone.
The operator was struggling to keep the line connected.