When you join a group of friends to build a huge sandcastle on the beach, your impressive structure is the result of collaboration, or working together toward a common goal.
Working with another person — or a group of people — to make something together is collaboration. You can also describe the result of your work, like the elaborately decorated cake you made with your best friend, as a collaboration. During World War II, the word collaboration began being used to mean "working traitorously with an enemy," and became a very serious crime.
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