(~s)
1.
Collaboration is the act of working together to produce a piece of work, especially a book or some research.
Close ~ between the Bank and the Fund is not merely desirable, it is essential.
...scientific ~s...
Drummond was working on a book in ~ with Zodiac Mindwarp.
N-VAR: oft N with n, N between pl-n, in N
2.
A ~ is a piece of work that has been produced as the result of people or groups working together.
He was also a writer of beautiful stories, some of which are ~s with his fiancee.
N-COUNT: usu N between pl-n, N with n
3.
Collaboration is the act of helping an enemy who is occupying your country during a war.
She faced charges of ~.
N-UNCOUNT: usu with supp, oft N with n disapproval