Parameter

Parameter - A quantity, usually unknown, such as a mean or a standard deviation characterizing a population. Commonly misused for "variable," "characteristic," or "property."

[Category=Quality Assurance ]

Source: Massachusetts Department of Environmental Protection, 24 March 2011 07:29:54, http://www.mass.gov/dep/cleanup/laws/glossa01.htm

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Parameter - a component of technology, product or process that can assume a nominal value that defines it.

[Category=Quality ]

Source: The Quality Portal, 17 April 2011 11:33:52, http://thequalityportal.com/glossary/l.htm

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parameter - 

   (1) [map projections] One of the variables that define a specific instance of a map projection or a coordinate system. Parameters differ for each projection and can include central meridian, standard parallel, scale factor, or latitude of origin.
   (2) [mathematics] A variable that determines the outcome of a function or operation.

[Category=Geospatial ]

Source: esri, 04 July 2012 08:50:13, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation