Definify.com
Webster 1913 Edition
X
X
(ĕks)
. X, the twenty-fourth letter of the English alphabet, has three sounds; a compound nonvocal sound (that of ks), as in wax; a compound vocal sound (that of gz), as in example; and, at the beginning of a word, a simple vocal sound (that of z), as in xanthic. See Guide to Pronunciation, §§ 217, 270, 271.
The form and value of X are from the Latin X, which is from the Greek Χ, which in some Greek alphabets had the value of ks, though in the one now in common use it represents an aspirated sound of k.
Webster 1828 Edition
X
X
, the twenty fourth letter of the English Alphabet, is borrowed from the Greek. In the middle and at the end of words, it has the sound of ks, as in wax, lax, luxury. At the beginning of a word, it has precisely the sound of z. It is used as an initial, in a few words borrowed from the Greek.As a numeral, X stands for ten. It represents one V, which stands for five, placed on the top of another. When laid horizontally it stands for a thousand, and with a dash over it, it stands for ten thousand. As an abbreviation, X. Stands for Christ, and in Xn. Christian; Xm. Christmas.
Definition 2024
ẍ
ẍ
Composition: x [U+0078] + ̈ [U+0308]
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Translingual
Letter
ẍ lower case (upper case Ẍ)
Symbol
- (mathematics) The second-order differential of x, using Newtonian calculus notation; the x-component of the acceleration.