Duodecimally is an unusual word that refers to something that is divided into twelve parts. If you're looking for synonyms to use instead of this word, there are a few options to consider. For example, you might use the word "twelvefold" to describe something with twelve parts or aspects. Alternatively, you could use the phrase "divided into twelve parts" to convey the same meaning. Another possible synonym would be "dodecuple," which refers to something that is multiplied by twelve. Whatever word or phrase you choose, just make sure it accurately conveys the intended meaning and fits within the context of your writing.