"x" Definition

Definitions for the word "x" from multiple English dictionaries.

1.
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.
Source: The 1913 Webster Unabridged Dictionary, 1913
2. n.
(also x) (pl. Xs or x''s) 1 twenty-fourth letter of the alphabet. 2 (as a roman numeral) ten. 3 (usu. X) algebra first unknown quantity. 4 unknown or unspecified number or person etc. 5 cross-shaped symbol used esp. To indicate position (x marks the spot) or incorrectness, or to symbolize a kiss or a vote, or as the signature of a person who cannot write.
Source: Oxford English Dictionary, 1884
3. symb.
(of films) classified as suitable for adults only.
Source: Oxford English Dictionary, 1884

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