Longman Dictionary of Contemporary English homepage

collaborator

noun
     
col‧lab‧o‧ra‧tor [countable]
1 someone who helps their country's enemies, for example by giving them information, when the enemy has taken control of their country [↪ collaborate, collaboration]:
Their job was to identify enemy collaborators.
2 someone who works with other people or groups in order to achieve something, especially in science or art [↪ collaborate, collaboration]:
collaborators on a biography of Dickens

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