Kerning: The narrowing of space between two letters so that they become closer and take up less space on the page.
Key Plate: The printing plate that is used as a guide for the other plates in the color printing process; it usually has the most detail.
Keying: The use of symbols, usually letters, to code copy that will appear on a dummy.
Keyline: Lines that are drawn on artwork that indicate the exact placement, shape and size of elements including halftones, illustrations etc.
Kiss Impression: A delicate printed impression, just heavy enough to be seen.
Kraft: A coarse unbleached paper used for printing and industrial products.