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 be printed with slight variation in registration. ...
Found on http://en.wikipedia.org/wiki/Keyline

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 on http://www.encyclo.co.uk/local/21179

Keyline

Alternate term for Mechanical.
Found on http://www.e-printing.co.uk/glossary.htm

Keyline

An outline drawn or set on artwork showing the size and position of an illustration or halftone.
Found on http://www.encyclo.co.uk/local/20829

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 on http://www.nmoa.org/Library/index.htm

Keyline

Lines that are drawn on artwork that indicate the exact placement, shape and size of elements including halftones, illustrations etc.
Found on https://www.encyclo.co.uk/local/22539

keyline

outline showing shape and position of an illustration
Found on http://phrontistery.info/k.html
No exact match found