bifold

== English == === Etymology === From bi- +‎ -fold. === Adjective === bifold (not comparable) Twofold, double. Of two kinds. , Act V, Scene II, page 77: O madneſſe of diſcourſe, / That cauſe ſets vp with and againſt it ſelfe, / By-fould authority : where reaſon can reuolte / Without perdition, and loſſe aſſume all reaſon, / Without reuolt. === Noun === bifold (plural bifolds) (carpentry) A door, window, shutter, or divider consisting of two equal panels hinged together so that it opens by folding the panels against each other. A sheet of paper or cardboard folded in half along a crease down the center. A wallet, billfold, or carrying case with a single fold, so that it opens like a book. A crease or turn that causes something to double back on itself.