Overlay

Overlays - The authorized use of a list to add information and data, through match identification, by tagging to another list. The transfer can be demographics, or a telephone number, or a job function, even psychographic data on buying habits.

[Category=Database Marketing ]

Source: Postcom, 25 March 2010 11:32:14, http://postcom.org/public/admail_image/glossary.htm

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Overlay - An overlay is the process used to append a customer or prospect mailing list with demographic data or other information.

Source: NextMark, 16 August 2009 10:40:53, https://www.nextmark.com/resources/glossary-of-terms/ ?glossaryTermId=a0800000000F8enAAC

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overlay - 

   (1) [analysis/geoprocessing] A spatial operation in which two or more maps or layers registered to a common coordinate system are superimposed, either digitally or on a transparent material, for the purpose of showing the relationships between features that occupy the same geographic space.
   (2) [analysis/geoprocessing] In geoprocessing, the geometric intersection of multiple datasets to combine, erase, modify, or update features in a new output dataset.

[Category=Geospatial ]

Source: esri, 01 July 2012 09:40:55, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation