Offset Lithography or Offset Printing
A common printing process in which the image to be printed is transferred from a metal plate to a rubber blanket onto paper
Offsetting
Transfer of ink or impression from one page to the opposite page
Opacity
The property of paper that minimizes the show-through on a printed sheet
Outline halftone
A halftone image with the background removed to outline the main image
Overrun
Production of larger quantities than ordered
Oversampling
Scanning at more than the ideal sampling rate