Definitions from Wiktionary ( )

▸ adjective:  In a direction against the flow of a current or stream of fluid (typically water); upriver.
▸ adjective:  (figurative) Occurring earlier than something else; (also, usually, especially) being an influence on something else; causing a consequence for something else.
▸ adjective:  (oil industry) Involving exploration and pre-production rather than refining and selling.
▸ adjective:  (computer networking) In the direction from the client to the server.
▸ adjective:  (software) Maintained, owned, or associated with the original developers of the given software; in contrast to a modified version downstream.
▸ adjective:  (biology) Towards the leading end (5′ end) of a DNA molecule.
▸ adverb:  Against the current.
▸ verb:  (intransitive) To stream upward.
▸ verb:  (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.
▸ noun:  Part of the river towards the upstream direction.
▸ noun:  (open-source software) The original developers or maintainers of software.

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