American English

Definition of complication noun from the Oxford Advanced American Dictionary



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  1. 1[countable, uncountable] a thing that makes a situation more complicated or difficult The bad weather added a further complication to our trip.
  2. 2[countable, usually plural] (medical) a new problem or illness that makes treatment of a previous one more complicated or difficult She developed complications after the surgery. Infertility is one of the complications of this type of radiotherapy.
See the Oxford Advanced Learner's Dictionary entry: complication