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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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: Webster's Revised Unabridged Dictionary (1913)