GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Duodecimal , a. [L. duodecim twelve. See Dozen.] Proceeding in computation by twelves; expressed in the scale of twelves. -- Du`o*dec"i*mal*ly, adv.
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2.       
   Duodecimal, n.
   A twelfth part; as, the duodecimals of an inch.
   1913 Webster
   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