From The Collaborative International Dictionary of English v.0.44 [gcide]:
Duodecimal \Du'o*dec"i*mal\, adjective [L. duodecim twelve. See {Dozen}.] Proceeding in computation by twelves; expressed in the scale of twelves. -- {Du'o*dec"i*mal*ly}, adverb
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Duodecimal \Du'o*dec"i*mal\, noun
1. A twelfth part; as, the duodecimals of an inch.
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.
From WordNet (r) 2.0 [wn]:
adjective
1: based on twelve; "the duodecimal number system"
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