Longman Dictionary of Contemporary English homepage

collaboration

noun
     
col‧lab‧o‧ra‧tion
1 [uncountable and countable] when you work together with another person or group to achieve something, especially in science or art:
The company is building the centre in collaboration with the Institute of Offshore Engineering.
collaboration between
a collaboration between the two theatres
collaboration with
The project has involved collaboration with the geography department.
2 [uncountable] when someone gives help to a country that their country is fighting a war with, especially one that has taken control of their country

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