The phrase "aforementioned one" refers to something that has already been mentioned. It is often used to avoid repetition or to refer back to a previously introduced idea or person. Some synonyms for "aforementioned one" include "preceding one," "aforenamed one," "aforesaid one," "afore-mentioned individual," and "earlier mentioned party." These phrases can be useful in academic or professional writing, as they offer alternatives to the same phrase and can make the writing more varied and engaging. In addition to the above, other synonyms could include "earlier referred to person," "previously addressed individual," and "preceding party".