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the point of origin of a river.
The source, which may be a lake outlet or a stream receiving its water from a spring, swamp, or glacier, ordinarily corresponds to the place where the permanent channel of the watercourse appears. In a river system having multiple sources, the main source is considered the one farthest from the mouth and largest in volume. It is not unusual for the main channel of a river and its sources to have different names; for instance, the Severnaia Dvina is formed by the confluence of the Sukhona and the lug, the Amur by that of the Shilka and Argun’.
source(1) One side of a field effect transistor. See drain.
(2) The point of creation. See source code and source document.
(3) (The Source) An online information service in McLean, VA, launched in 1979 and purchased by CompuServe in 1989. See CompuServe.