perturb


Concise Oxford English Dictionary © 2008 Oxford University Press:
perturb/pəˈtɜːb/
verb
  • 1 make anxious or unsettled.
  • 2 alter the normal or regular state or path of (a system, moving object, or process).
– derivatives
perturbable adjective,
perturbative adjective
perturbingly adverb.
– origin ME: from OFr. pertourber, from L. perturbare, from per- ‘completely’ + turbare ‘disturb’.
'perturb' also found in these Oxford entries:

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