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Definition of upstream

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up·stream  audio  (pstrm) KEY  

ADVERB:
In, at, or toward the source of a stream: paddling upstream.
ADJECTIVE:
  1. In a direction opposite to that of a stream's current: upstream traffic.
  2. Business Closer to the point of production or manufacture than to the point of sale.



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The American Heritage® Dictionary of the English Language, Fourth Edition.
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