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noun. The 24th letter of the modern English alphabet.

noun. Any of the speech sounds represented by the letter x.

noun. The 24th in a series.

noun. Something shaped like the letter X.

noun. A mark inscribed to represent the signature of one who is unable to sign one's name.

noun. An unknown or unnamed factor, thing, or person.

transitive verb. To mark or sign with an X.

transitive verb. To delete, cancel, or obliterate with a series of X's. Often used with out.

The chemical symbol of xenon.

In electricity, the symbol for reactance in alternating-current circuits.

In wireless telegraphy, a local disturbance causing a false signal; a stray.

The twenty-fourth letter and nineteenth consonant-sign in the English alphabet.

As a numeral, X stands for ten.

As an abbreviation, X. stands for Christ, as in Xn. (Christian), Xmas. (Christmas).

As a symbol: In ornithology, in myological formulas, the symbol of the semitendinosus muscle.

In mathematics:

[lowercase] In algebra, the first of the unknown quantities or variables.

[l. c] In analytical geometry, an abscissa or other rectilinear point-coördinate.

In mechanics, the component of a force in the direction of the axis of x.

Originally, a mark on brewers' casks; hence, a name given to ale of a certain quality. Compare XX, XXX.

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.

noun. The twenty-fourth letter of the basic modern Latin alphabet.

noun. voiceless velar fricative.

noun. An unknown variable.

noun. The first coordinate in Cartesian coordinates, representing horizontal position.

noun. A kiss at the end of a letter, or similar missive.

noun. The twenty-fourth letter of the English alphabet, called ex and written in the Latin script.

noun. the cardinal number that is the sum of nine and one; the base of the decimal system

noun. street names for methylenedioxymethamphetamine

adjective. being one more than nine

noun. the 24th letter of the Roman alphabet