A method of folding paper or material in alternating directions so it opens like a fan, commonly used for computer paper or documents.
From fan (noun) plus fold (Old English fealdan), describing the accordion-like folding pattern that mimics the way a folding fan opens and closes.
Before printers, computer rooms used fanfold paper constantly—it fed automatically through printers like an infinite ribbon, which was revolutionary for producing pages without human intervention.
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