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col‧lab‧o‧ra‧tor
[countable]
[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.
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
collaborators on a biography of Dickens