Webster's Revised Unabridged Dictionary · 1913

Thirteen

Thirteen (thẽr"tēn`) , adjective

[Old English threttene, Anglo-Saxon þreótēne, þreótyne. See Three, and Ten, and compare Thirty.]

One more than twelve; ten and three; as, thirteen ounces or pounds.

Thirteen , noun

1.
The number greater by one than twelve; the sum of ten and three; thirteen units or objects.
2.
A symbol representing thirteen units, as 13 or xiii.