source

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The point at which something springs into being or from which it derives or is obtained.
2. n. The point of origin, such as a spring, of a stream or river. See Synonyms at origin.
3. n. One that causes, creates, or initiates; a maker.
4. n. One, such as a person or document, that supplies information: A reporter is only as reliable as his or her sources.
5. n. Physics The point or part of a system where energy or mass is added to the system.
6. v. To specify the origin of (a communication); document: The report is thoroughly sourced.
7. v. To obtain (parts or materials) from another business, country, or locale for manufacture: They sourced the spoke nuts from our company.
8. v. To obtain parts or materials from another business, country, or locale: They are sourcing from abroad in order to save money.

Century Dictionary and Cyclopedia

1. n. A rising; a rise; a soaring.
2. n. A spring; a fountainhead; a wellhead; any collection of water on or under the surface of the ground in which a stream originates.
3. n. A first cause; an origin; one who or that which originates or gives rise to anything.
4. To rise, as a hawk; swoop; in general, to swoop down; plunge; sink; souse. See souse.
5. To spring; take rise.
6. To plunge down; souse.
7. n. In geometry, a place of transition from space of n ± 1 into space of n dimensions.
8. n. In electricity: That point or region in an electric circuit at which abrupt difference of potential exists so that current flows from it on one side through the circuit and toward it through the circuit from the other side. Thus a dynamo generator, a voltaic cell, or a charged condenser is a source of current in the circuit in which they are placed.
9. n. In the case of current flow in plane sheets, a point at which the current enters the sheet.

Wiktionary

1. n. The person, place, or thing from which something (information, goods, etc.) comes or is acquired.
2. n. Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates.
3. n. A reporter's informant.
4. n. computing Source code.
5. n. electronics The name of one terminal of a field effect transistor (FET).
6. v. To obtain or procure: used especially of a business resource.
7. v. transitive To find information about (a quotation)'s source (from which it comes): to find a citation for.

GNU Webster's 1913

1. n. obsolete The act of rising; a rise; an ascent.
2. n. The rising from the ground, or beginning, of a stream of water or the like; a spring; a fountain.
3. n. That from which anything comes forth, regarded as its cause or origin; the person from whom anything originates; first cause.

WordNet 3.0

1. n. (technology) a process by which energy or a substance enters a system
2. v. get (a product) from another country or business
3. n. a person who supplies information
4. n. anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies
5. n. a publication (or a passage from a publication) that is referred to
6. v. specify the origin of
7. n. the place where something begins, where it springs into being
8. n. a facility where something is available
9. n. anything that provides inspiration for later work
10. n. someone who originates or causes or initiates something
11. n. a document (or organization) from which information is obtained