Object-oriented graphics or vector graphics - Used for line drawings, logos, and other images that require smooth edges. Made up of mathematically defined curves and line segments called vectors. It is beneficial in printing, due to ability to be enlarged without loss of detail.
OCR (Optical Character Recognition) - Computer software capable of parsing (reading) scanned images of documents and intelligently detecting and converting the various page elements into (editable) Fonts, vector graphics and tables.
Offset printing - An indirect printing process whereby ink is transferred to the paper by a blanket that carries an impression from the printing plate, rather than directly from the plate itself. This is the most common method of commercial printing at this time.
Opacity - The quality of being impenetrable by liquids or light. With printing paper it is the ability to keep photographs and print from showing through to the other side.
