Across x Around:
The way to state the dimensions of a label.

Across:
"Across the web" is the label width on the printing press being used; also the first number of a label dimension. 

Around:
The length of the label up to the maximum a specific press can handle, also the last number of a label dimension.

Black and White:
Usually refers to the final art without the use of color.

Cells: 
Individual depressions or wells in the surface of an engraved cyliner that retain ink.

CMYK:
Separations of art into cyan, magenta, yellow, black (4 color process).

Color Separations:
Set of 4 negatives for making plates for 4 color process.

Color Values:
Intensities and shading of color.

Comprehensive Dummy or "comp":
Complete simulation of a printed piece. Usually used prior to final art production.

Contact Positive:
A positive print made by placing a film negative into contact with undeveloped film and exposing to light.

Contact Print:
A general term applied to any photographic image made in a vacuum or printing frame by direct contact-as opposed to enlargements or non-contact.

Continuous Tone Copy:
All photographs and those illustrations having a range of shades.

Coverage:
Usually refers to the amount of ink or color covering any specific area.

Crop Marks:
Horizontal and vertical marks to show label outline/dimensions.

Design:
The creation of work to be printed.

Distortion:
Altering the arts dimension in the web direction to match the print cylinder circumference.

Dot Gain or Spread:
Phenomenon of dots printing larger on paper than they are on negatives or prints.

Emulsion:
A gelatin coating containing light sensetive silver salts.

Exposure:
This term is used for the sum of the time and the intensity of illumination acting upon light sensitive material.

Ghosting:
Phenomenon of a faint image on a printed label where it is not intended to appear.

Halftone:
To photograph continuous tones through a screen to convert the image into dots.

Hickey:
Donut-shaped spot or imperfection in printing, most visible in areas of heavy ink coverage.

Ink Pan or Ink Fountain:
Resevoir for ink in which the ink pick up cylinder rotates during printing.

Line Work:
Refers to artwork or photographic material which contains no tone values.

Match Print: 
A color proof made from platemaker negatives.

Mechanical:
Camera ready assembly of type, graphics and other line copy complete with instructions to the printer.

Moire (pronounced moh-ray):
An undesirable checkerboard or plaid effect caused by the improper relationship of the screen angles used on the various plates.

Overlay:
Tranparent material placed upon artwork.

Photopolymer:
A flexible, light sensitive material used to make printing plates.

PMS:
Pantone® Matching System. Universal system of color with numerical codes.

PMT:
Photo mechanical transfer.

Print Cylinder:
The cylinder the photo polymer plate is mounted on with "stickyback".

Process:
Commonly used in terms indicating the number of colors involoved in a reproduction, such as 4 color process, 3 color process etc.

Production Art:
Taking the design and creating the art and plates that will accurately reproduce the design.

Progressive Proofs:
Proofs of color plates showing each color by itself and then in combination with the other process colors.

Reduction | Enlargement:
Altering of the artwork to fit a die, change etc. Oval art must be 100%.

Register:
A term used to describe the fit of one color with another, or of one positive or negative to another carrying the same image. "In register" indicates a proper fit, "out of register" indicates the opposite. 

Repeat:
The length of the printed piece (web direction) plus one space between the items.

Screen | Halftone:
Refers to an image created by the use of various size dots. Tonal gradations are created by controlling the size of the dots.

Screen Tint:
Area of image printed with dots so ink coverage is less than 100 percent and simulates shading or lighter color.

Separation:
Breakdown of colors in a piece of copy into primary printing colors or special colors.

Step and Repeat:
The number of images across and around on a printing plate.

Transparency:
A colored photograph on transparent film.

Trap:
Setting up art so one color prints over the other to give a clean print.

UPC:
Universal Product Code. A bar code system for product identification.

Web:
Paper or other stock on a roll in a printing press; the full length of paper contained in a roll of stock as it passes through the press.