Entry 3 senses · 2 variants Webster, 1913 Seventeen /sĕv'-ən-tēn'/ · Sev·en·teen · IPA /ˈsɛv.ən.tiːn/ a. n. 01 a. One more than sixteen; ten and seven added; as, seventeen years. 1. One more than sixteen; ten and seven added; as, seventeen years. 02 n. The number greater by one than sixteen; the sum of ten and seven; seventeen units or objects. 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.