origami, the art of paper folding

in computer programming:

bankruptcy

bifold door

fold (geology)

Folding@home, a distributed computing project designed to perform computationally intensive simulations of protein folding and other molecular dynamics.

protein folding

pattern welding, the folding of metal

fold, a program in the GNU Core Utilities

Mathematics of paper folding

Sheepfold, an enclosure for sheep

above the fold

Paper folding

folding (chemistry) or intramolecular self-assembly of molecules to assume a specific shape

case folding is a term denoting the conversion of all characters in a string to lower- or upper-case

skin fold

fold, a family of higher-order functions in functional computer programming

code or text folding (as in a folding editor for folding code or text)

In functional languages folding refers to processing some data structure and accumulating a result.

Folding in cooking refers to a gentle mixing technique, somewhere between a cutting motion and a stirring motion, used to incorporate ingredients into a batter or other mixture, such as for a cake.