The Collaborative International Dictionary
Duodecimally
Duodecimal \Du`o*dec"i*mal\, a. [L. duodecim twelve. See Dozen.] Proceeding in computation by twelves; expressed in the scale of twelves. -- Du`o*dec"i*mal*ly, adv.
Wiktionary
duodecimally
adv. In a duodecimal manner; by twelves.