Source : Webster's Revised Unabridged Dictionary (1913)

Seventeen \Sev"en*teen`\, a. [OE. seventene, AS. seofont[=y]ne,
   i. e., seven-ten. Cf. {Seventy}.]
   One more than sixteen; ten and seven added; as, seventeen
   years.

Seventeen \Sev"en*teen`\, n.
   1. The number greater by one than sixteen; the sum of ten and
      seven; seventeen units or objects.

   2. A symbol denoting seventeen units, as 17, or xvii.

Source : WordNet®

seventeen
     adj : being one more than sixteen [syn: {17}, {xvii}]
     n : the cardinal number that is the sum of sixteen and one [syn:
          {17}, {XVII}]