col ‧ lab ‧ o ‧ ra ‧ tion /kəˌlæbəˈreɪʃ ə n/ BrE AmE noun
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