WordWeb Online

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

1. Being one more than nine
   - ten, 10

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

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, William