noun
a type of folder with multiple pockets or compartments that expand and contract like an accordion, used for organizing and storing documents
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The accountant organized all the financial documents in an accordion folder for easy access.
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I picked up an accordion folder to keep all my class notes in one place.
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I found a cool accordion folder at the store to stash all my important papers.
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Her mind was like an accordion folder, neatly compartmentalizing all her thoughts and memories.