n.
1. The point at which something springs into being or from which it derives or is obtained.
2. The point of origin, such as a spring, of a stream or river.
3. One that causes, creates, or initiates; a maker.
4. One, such as a person or document, that supplies information.
5. Physics The point or part of a system where energy or mass is added to the system.
v.tr.
1. To specify the origin of (a communication); document.
2. To obtain (parts or materials) from another business, country, or locale for manufacture:
v.intr.
To obtain parts or materials from another business, country, or locale: They are sourcing from abroad in order to save money.