noun
a window or part of a window set on a hinge so that it opens like a door
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The architect designed the house with large casement windows to allow for plenty of natural light.
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I love opening up the casement windows in the morning to let in the fresh air.
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Don't forget to close the casement before you leave, we don't want any bugs getting in.
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The casement of opportunity opened for her when she least expected it.