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[uhp-streem] /ˈʌpˈstrim/
toward or in the higher part of a stream; against the current.
directed upstream; situated upstream:
an upstream journey; an upstream hideout.
Commerce. of or pertaining to the early stages in the operations of a business or industry, as exploration and production in the oil business (opposed to downstream).
against or opposite to the direction of transcription, translation, or synthesis of a DNA, RNA, or protein molecule.
1675-85; up- + stream Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for upstream
  • The ability to elaborate learning objectives is at the upstream of promoting student confidence.
  • Starved of water by upstream diversions, heavy with silt, it braids through jungles of salt cedar.
  • Caught later, during its voyage upstream, the fish's color will be off and the fat stores depleted.
  • When the crews heard the explosion, however, they rushed to their stations and then moved upstream to help.
  • In other broadband mediums, the upstream speed can be considerably slower than downstream.
  • upstream production cost is not the limiting economic factor for biologics.
  • upstream transmission is at a lower frequency or on phone wires.
  • Once salmon enter freshwater on their upstream journey, they stop feeding and depend on stored energy reserves.
  • They confer briefly, stow away their equipment, and set off again upstream.
  • Most behavioral traits have many upstream variables, some of which interact with each other.
British Dictionary definitions for upstream


adverb, adjective
in or towards the higher part of a stream; against the current
(in the oil industry) of or for any of the stages prior to oil production, such as exploration or research Compare downstream (sense 2)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for upstream

1680s, from up- + stream. In common use from c.1890.

Online Etymology Dictionary, © 2010 Douglas Harper
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upstream in Technology

Fewer network hops away from a backbone or hub. For example, a small ISP that connects to the Internet through a larger ISP that has their own connection to the backbone is downstream from the larger ISP, and the larger ISP is upstream from the smaller ISP.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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