IPA: /priˈɛzɪstɪŋ/
KK: /priˈɛksɪstɪŋ/
Something that was already in place or present before a certain time or event.
The preexisting conditions made it difficult for the doctors to find a suitable treatment.
To exist before a certain time or event.
The preexisting conditions made it difficult for the doctors to treat the patient effectively.
Past: preexisted
Past Participle: preexisted
Preexisting → It is formed from "pre-" (meaning before) and "existing" (from the Latin "existere", meaning to stand out or to be). The word "preexisting" refers to something that exists before a certain point in time or event.
Think of something that 'exists' ('existing') 'before' ('pre-') a certain time — that's what preexisting means.