Twelvefold is a term that indicates that something is multiplied by twelve. Synonyms for this word include "dodecuple," "twelvetimes," "duodecimal," and "xii." Dodecuple means multiplied by twelve while duodecimal refers to a numbering system based on the number twelve. Twelvetimes is a more informal synonym that suggests something has happened twelve times. XII is the Roman numeral equivalent to the number twelve. Overall, each of these synonyms for twelvefold carries different subtleties and can be used in different contexts depending on the desired effect.