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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.
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upstreamFrom the consumer to the provider. See downstream and download vs. upload.
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