1. 
   Keyline
   A keyline, in graphic design, is a boundary line that separates color and monochromatic areas or differently colored areas of printing on a given page or other printed piece. The line itself, usually consisting of a black (or other dark colored) border, provides an area in which lighter colors can ...
   Found op http://en.wikipedia.org/wiki/Keyline
   
   
2. 
   Keyline
   An outline drawn or set on artwork showing the size and position of an illustration or halftone.
   Found op http://www.encyclo.co.uk/local/20829
   
   
3. 
   Keyline
   Can be any one of many partial or complete descriptions of past buying history codes to include name-and-address information and current status.
   Found op http://www.nmoa.org/Library/index.htm
   
   
4. 
   KEYLINE
   A line drawn on artwork which indicates an area for tint-laying, positioning of half-tones, etc. where this must be done at a later stage.
   Found op http://www.fiskprinters.co.uk/print%20glossary.html
   
   
5. 
   Keyline
   Alternate term for Mechanical.
   Found op http://www.e-printing.co.uk/glossary.htm
   
   

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