Entry 3 senses · 2 variants Webster, 1913 Sixteen /sĭk-stēn'/ · Six·teen · IPA /ˈsɪks.tiːn/ a. n. 01 a. Six and ten; consisting of six and ten; fifteen and one more. 1. Six and ten; consisting of six and ten; fifteen and one more. 02 n. The number greater by a unit than fifteen; the sum of ten and six; sixteen units or objects. 1. The number greater by a unit than fifteen; the sum of ten and six; sixteen units or objects. 2. A symbol representing sixteen units, as 16, or xvi.