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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. Street names for methylenedioxymethamphetamine
   - Adam, ecstasy, XTC, go, disco biscuit, cristal, 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 Exterminator X,Y, and Zee