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Definitions of keyline on the Web:

In artwork, an outline drawing of finished art to indicate the exact shape, position and size for such elements as halftones, line sketches, etc.
www.paperspecs.com/resources/glossary/k.htm

A black lined area on a layout or art board indicating a precise area for the placement of a color or black and white reproduction. It is generally noted specifically to use the
www.rockprint.com/dictionary.shtml

Any one of many partial or complete descriptions of past buying history coded to include name and address information and current status.
www.billfryer.com/glossary/glossfk.html

This is an image placer in layout that represents where an image is to go when it is printed. This placeholder doesn't print, but it fits the position and size of the image that will be printed in that spot. This Keyline often is a rectangle with an x through it.
www.adigitaldreamer.com/2/graphicdesignglossary.htm

This is the guide used in making plates and printing a piece--a diagram of copy and art for reproduction. (See mechanical)
www.digitalinkprint.com/glossary.html

A keyline, in graphic design, is a boundary line which separates color and monocromatic areas, or differently colored areas of printing on a given page or other printed piece. ...
en.wikipedia.org/wiki/Keyline

An outline drawn or set on artwork showing the size and position of an illustration or halftone.
www.printmatch.com.au/work/terms.html