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The cardinal number that is the sum of nine and one; the base of the decimal system.
- synonyms: ten, 10, tenner, decade
The 24th letter of the Roman alphabet.
- synonyms: ex
Street names for methylenedioxymethamphetamine.
- synonyms: Adam, ecstasy, XTC, go, disco biscuit, cristal, hug drug

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APA	WordNet. (2010). x. Retrieved September 20, 2026, from http://smartdefine.org/x/definitions/1217746
Chicago	WordNet. 2010. "x" http://smartdefine.org/x/definitions/1217746 (accessed September 20, 2026).
Harvard	WordNet 2010, x, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/x/definitions/1217746>.
MLA	WordNet. "x" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/x/definitions/1217746>

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