bifolds

Noun

bifold (plural bifolds)

1. A door, window, shutter, or divider consisting of two equal panels hinged together so that it opens by folding the panels against each other.
   • Wood-finished insulative shutters set as bifolds at the window.1989, Karla J. Nielson, Window Treatments, →ISBN, page 21
2. A sheet of paper or cardboard folded in half along a crease down the center.
   • AFSl is made up of thirteen bifolds, or fifty-two pages (each unfolded folio measuring 13.5 x 21 inches), beginning with the title page and continuing for fifty-one numbered pages.2006, Betty Buchanan, Amy Beach, The Canticle of the Sun, →ISBN, page 87
3. A wallet, billfold, or carrying case with a single fold, so that it opens like a book.
   • A 1996 survey showed that men under age 20 buy three times as many trifolds as bifolds. So a trifold wallet becomes a habit, even after it has expanded to the size and shape of a jumbo bar of soap.1998 July, Robert Frick, “What Your Wallet Says About You”, in Kiplinger's Personal Finance, volume 52, number 7, page 97
4. A crease or turn that causes something to double back on itself.
   • I want to learn how to play, and that's all puzzles and problems, and what do I care when I go to play a game about parallels and bifolds?1898, George Manville Fenn, Jungle and Stream: Or, The Adventures of Two Boys in Siam, page 238

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