What is another word for most preexisting?
Pronunciation: [mˈə͡ʊst pɹˈiːksɪstɪŋ] (IPA) 
Most preexisting can be replaced by several different synonyms, depending on the context. Among those are: already present, prior, pre-established, existing beforehand, previously existing, formerly existing, and preexistent. These synonyms imply that something was already in place or had been there before a particular time or event. For instance, if talking about a preexisting condition, it implies the condition was already present before seeking medical treatment. Alternatively, preexisting could imply a pre-established agreement or understanding, meaning that an agreement was in place before a current situation or decision. Therefore, the choice of synonyms for most preexisting will depend on the intended meaning and the context in which it is used.
