Definitions from Wiktionary (source)

▸ noun:  The person, place, or thing from which something (information, goods, etc.) comes or is acquired.
▸ noun:  Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates.
▸ noun:  A reporter's informant.
▸ noun:  (computing) Source code.
▸ noun:  (electronics) The name of one terminal of a field effect transistor (FET).
▸ noun:  (graph theory) A node in a directed graph whose edges all go out from it; one with no entering edges.
▸ noun:  (mathematics, category theory) The domain of a function; the object which a morphism points from.
▸ verb:  To obtain or procure: used especially of a business resource.
▸ verb:  (transitive) To find information about (a quotation)'s source (from which it comes): to find a citation for.

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