a. [ L. duodecim twelve. See Dozen. ] Proceeding in computation by twelves; expressed in the scale of twelves. -- Du`o*dec"i*mal*ly, adv. [1913 Webster]
n. 1. A twelfth part; as, the duodecimals of an inch. [ 1913 Webster ]
2.pl. (Arch.) A system of numbers, whose denominations rise in a scale of twelves, as of feet and inches. The system is used chiefly by artificers in computing the superficial and solid contents of their work. [ 1913 Webster ]