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X,

24th letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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. In English it has no peculiar sound, but stands for the combination ks as in fox, or gz as in exempt, or, initially, for the sound of z as in xenia. In words from Greek, x transliterates the 14th Greek letter, xi, a letter perhaps quite unrelated to the Roman x in form. The formal Greek correspondent of x was chi, hence it is used in phonetics to represent a velar fricative like ch in loch. As the initial of the name Christ, X has become a symbol for it, e.g., in Xmas and in the monogram XP (chi rho). In Roman numerals X stands for 10.

What does it mean when you dream about an X?

X in a dream can refer to the Roman numeral for ten, for “X marks the spot” in a map, the cross, an error, or “X-rated.”

X

(spectroscopy)

X

(convention)
Used in various speech and writing contexts (also in lowercase) in roughly its algebraic sense of "unknown within a set defined by context" (compare N). Thus, the abbreviation 680x0 stands for 68000, 68010, 68020, 68030 or 68040, and 80x86 stands for Intel 80186, Intel 80286, Intel 80386 or Intel 80486. A Unix hacker might write these as 680[0-4]0 and 80[1-4]86 or 680?0 and 80?86 respectively; see glob.

X

(graphics)
An alternative name for the X Window System.

X

(storage)
A suffix for the speed of a CD-ROM drive relative to standard music CDs (1x). 32x is common in September 1999.

x

(1) (eXit) To exit, close or delete. See X button.

(2) (heX) In programming, a symbol used to identify a hexadecimal number. For example, "0x0A" and "\x0A" specify the hex number 0A. See also X Window and MDI-X port.

(3) (times the original) A performance rating for optical drives, based on rotation speed (RPM) of the platter. Each "x" means "times the speed of the first specification," thus 10x means 10 times as fast as the original drive. See CD-ROM drives and DVD drives.

(4) (x-) The prefix used to describe a MIME type. For example, x-pdf and x-gzip refer to PDF and Gnu ZIP file formats, respectively. See MIME type.

(5) A prefix for cross; for example, x-platform means "cross-platform." See cross platform.

(6) (Mac OS X) X is the Roman Numeral for 10; thus OS X means "OS 10." See Mac OS X.

(7) (eXperience) See UX designer and user experience.
References in periodicals archive ?
99) Douglas Coupland, "Generation X'd," Details, June 1995, http://Coupland.
At least one fan in the crowd wore a Kessel T-shirt, but the name and number on the back had been X'd out.
Shant Israelyan of Ventura had an X'd out "SF" in duct tape on his rain slicker.