Prefatorily is a word that refers to something that is done as a preliminary or introductory action. There are several synonyms for this word, which can be used to convey the same meaning in various contexts. One such synonym is "preliminarily," which refers to an action that is taken before the main event or action. Another synonym is "introductory," which means something that is done at the beginning of an event or process. Other synonyms for prefatorily include "preparatory," "preparatively," and "provisionally." All of these words can be used to describe something that is done as a precursor or an initial step towards a larger action or event.