Source

Source - The source is the origin of the names on a mailing list. For example, names might be sourced from catalog buyers, magazine subscribers, trade show attendees, etc. It's important to understand the source of a list because it is a good indicator of its responsiveness to your offer. There is a big difference between mailing lists sourced from purchasing behaviors and mailing lists that are surreptitiously compiled.

Source: NextMark, 19 August 2009 16:17:21, https://www.nextmark.com/resources/glossary-of-terms/ ?glossaryTermId=a0800000000DiNAAA0

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source - 

   (1) [analysis/geoprocessing] The location or group of locations used as the starting point for distance analysis.
   (2) [network analysis] A junction feature that pushes flow away from itself through the edges of a geometric network. For example, in a water distribution network, pump stations can be modeled as sources, since they drive the water through the pipes away from the pump stations.

[Category=Geospatial ]

Source: esri, , http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation