/ ˈkɒlɑːʒ; NAmE kəˈlɑːʒ/ noun
1.
[ U , C ] the art of making a picture by sticking pieces of coloured paper, cloth, or photographs onto a surface; a picture that you make by doing this
2.
[ C ] a collection of things, which may be similar or different :
an interesting collage of 1960s songs
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WORD ORIGIN
early 20th cent.: from French , literally gluing .