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1. Being one more than nine
   - ten, 10

1. The 24th letter of the Roman alphabet
   - X, ex

1. The cardinal number that is the sum of nine and one; the base of the decimal system
   - ten, 10, tenner, decade
    
2. A street name for methylenedioxymethamphetamine
   - Adam, ecstasy, XTC, go, disco biscuit, hug drug

Derived forms: xs, Xs

See also: cardinal

Type of: alphabetic character, large integer, letter, letter of the alphabet, MDMA, methylenedioxymethamphetamine

Part of: Latin alphabet, Roman alphabet

Encyclopedia: X X, Y X, the movie X,y coordinates X,Y, and Zee X, The Exterminator X, The Life and Times of Malcolm X