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The point at which something springs into being or from which it derives or is obtained.
(noun)
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The point of origin, such as a spring, of a stream or river. See Synonyms at origin.
(noun)
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One that causes, creates, or initiates; a maker.
(noun)
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One, such as a person or document, that supplies information: A reporter is only as reliable as his or her sources.
(noun)
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Physics The point or part of a system where energy or mass is added to the system.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.