Webster’s Revised Unabridged Dictionary · 1913
Thirteen
Thir′teen′ (thẽr′tēn′), a. [OE. threttene, AS. þreótēne, þreótyne. See Three, and Ten, and cf. Thirty.] One more than twelve; ten and three; as, thirteen ounces or pounds.
Thir′teen′, n. 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.