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source

1. 
a. a spring that forms the starting point of a stream; headspring
b. the area where the headwaters of a river rise
2. anything, such as a story or work of art, that provides a model or inspiration for a later work
3. Electronics the electrode region in a field-effect transistor from which majority carriers flow into the interelectrode conductivity channel

Source

 

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

[sȯrs]
(electricity)
The circuit or device that supplies signal power or electric energy or charge to a transducer or load circuit.
(electronics)
The terminal in a field-effect transistor from which majority carriers flow into the conducting channel in the semiconductor material.
(mathematics)
The vertex with indegree 0 that is specified in the definition of an s-t network.
(nucleonics)
A radioactive material packaged so as to produce radiation for experimental or industrial use.
(physics)
In general, a device that supplies some extensive entity, such as energy, matter, particles, or electric charge.
A point, line, or area at which mass or energy is added to a system, either instantaneously or continuously.
A point at which lines of force in a vector field originate, such as a point in an electrostatic field where there is positive charge.
(spectroscopy)
The arc or spark that supplies light for a spectroscope.
(thermodynamics)
A device that supplies heat.

source

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.
References in periodicals archive ?
All income from such services is sourced under the SPOCI rules, except to the extent that the taxpayer can demonstrate that value was added outside space and international waters.
861-7(c), inventory purchased for resale is sourced at the place where the title and risk of loss to the goods passes from the seller to the buyer under the sales contract as free on board (FOB) place of destination or FOB place of shipment.
subsidiary to its foreign parent should be characterized and sourced by an analogy to interest.
Prior to 1987, taxpayers that derived income from the sale of personal property sourced such income under the "title passage" rule.