1. duodecimate - Noun
2. duodecimate - Verb
duodecimate (plural not attested)
(rare) Synonym of duodecimvirate: a group of twelve.
(rare, attested in the past participle only) Kill one twelfth of a group of people, especially by lot.
(rare, attested in the past participle only) Divide into twelfths; divide duodecimally.
Source: en.wiktionary.org