Longman Dictionary of Contemporary English homepage

complication

 noun
     
Related topics: Illness and Disability
com‧pli‧ca‧tion
1 [uncountable and countable] a problem or situation that makes something more difficult to understand or deal with:
The fact that the plane was late added a further complication to our journey.
2 [countable usually plural]MI medical a medical problem or illness that happens while someone is already ill and makes treatment more difficult:
Pneumonia is one of the common complications faced by bed-ridden patients.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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