adj. 1. Of, relating to, or based on the number 12: the duodecimal number system. 2. Of or relating to twelfths. n. A twelfth. [From Latin duodecimus, twelfth, from duodecim, twelve : duo, two; see dwo- in the Appendix of Indo-European roots + decem, ten; see dek in the Appendix of Indo-European roots.] |
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