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What does upstream mean?

Looking for the meaning or definition of the word upstream? Here's what it means.

Adjective
  1. in a direction against the flow of a current or stream; upriver
  2. (oil industry) involving exploration and pre-production rather than refining and selling
  3. (computing) in the direction from the client to the server
  4. (open-source software) maintained, owned or associated with the original developers of the given software; in contrast to a modified version downstream
  5. (biology) towards the leading end (5′ end) of a DNA molecule
Adverb
  1. against the current
Verb
  1. (intransitive) To stream upward.
  2. (transitive, open-source software) To have (a software library, patch, etc.) accepted by the original developers of the related software, so that they maintain and distribute it.
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