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This dictionary covers graphic design, prepress and print terminology.
Stan Schwartz supplied most of the terms of this online glossary.

A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z

X.25

Communication protocol

xerographic paper

Papers made to reproduce well in copy machines and laser printers.

Xerography

A photocopying/printing process in which the image is formed using the electrostatic charge principle. Many page printers currently use this toner based method of printing.

XGA

Abbreviation for eXtended Graphics Array, usually used to refer to a system capable of displaying 24-bit graphics at a resolution of 1024 x 768 pixels.

x-height

In typography the x-height equals the height of a lowercase letter ‘x’.

XLFD

Abbreviation for X Logical Font Description.

XM screening

Cross modulated screening is a screening algorithm that combines FM screening in highlights and shadows to capture fine details, and AM screening in midtones to achieve smooth gradations. Agfa Sublima is an example of this type of technology.

XML

Abbreviation for eXtensible Markup Language, a subset of SGML constituting a particular text markup language for interchange of structured data. XML is a trademark of the WWWC (World Wide Web Consortium). More information can be found on this page.

XMP

Abbreviation for Extensible Metadata Platform, a standard which was originally developed by Adobe for processing and storing information relating to the contents of a file inside the file itself.

XON/XOFF

Abbreviation for Transmitter On / Transmitter OFF.

XPS

Abbreviation for XML Paper Specification, a Microsoft alternative to the PDF file format. XPS is a page description language for exchanging documents which preserve their layout and offer good output quality on both the screen and printing devices.

X-rite

Manufacturer of densitometers and other measuring tools for the graphic arts industry

xtension

A small module or add-on that adds functionality to the layout program QuarkXPress