n A point where a waterway, such as a river, splits and goes two (or more) different directions.
n (geography) Used in the names of some river tributary | tributaries, e.g. West Fork White River and East Fork White River, joining together to form the White River of Indiana
n (figuratively) A point in time where one has to make a decision between two life paths.
n (chess) The simultaneousattack of two adversary pieces with one single attacking piece (especially a knight).
n (computer science) A splitting-up of an existing process into itself and a child process execute|executing parts of the same program.