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1. in or towards the higher part of a stream; against the current
2. (in the oil industry) of or for any of the stages prior to oil production, such as exploration or research
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
That portion of a process stream that has not yet entered the system or unit under consideration; for example, upstream to a refinery or to a distillation column.
Toward the source of a stream.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
upstreamFrom the consumer to the provider. See downstream and download vs. upload.
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