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Definition of X
1. Adjective. Being one more than nine.
2. Noun. The cardinal number that is the sum of nine and one; the base of the decimal system.
3. Noun. The 24th letter of the Roman alphabet.
Group relationships: Latin Alphabet, Roman Alphabet
Generic synonyms: Alphabetic Character, Letter, Letter Of The Alphabet
4. Noun. Street names for methylenedioxymethamphetamine.
Generic synonyms: Mdma, Methylenedioxymethamphetamine
Definition of X
1. Cardinal number. An unknown quantity or unknown value. ¹
2. Letter. (Latn-def en letter 24 ex) ¹
3. Noun. Any mark that looks like that letter, such as such a mark made by a person who cannot read or write, in lieu of a signature. ¹
4. Noun. (lacrosse) The spot behind the goal. ¹
5. Noun. (slang) Ecstasy, a particular street drug. ¹
6. Adjective. (context: Former British film certificate) Suitable only for those aged 16 or (later) 18 years and over. ¹
7. Adjective. (context: movie rating) Obscene. ¹
8. Abbreviation. (informal) Christ ¹
9. Abbreviation. (North America) cross, crossing ¹
10. Letter. (Latn-def en letter 24 ex) ¹
¹ Source: wiktionary.com
Medical Definition of X
1. Although the letter X is used as a symbol in various ways (such as X-rays, the x-axis of a graph, etc.), today the x usually refers to the x chromosome. (12 Dec 1998)