1. exist beforehand or prior to a certain point in time; - Example: "Did this condition pre-exist?"
The Collaborative International Dictionary of English v.0.48:
Preexist \Pre`["e]x*ist"\, v. i. [imp. & p. p. Pre["e]xisted;
p. pr. & vb. n. Pre["e]xisting.]
To exist previously; to exist before something else; to exist
before the current activity commenced; as, preexisting
illnesses are not covered by this insurance policy. [Also
[1913 Webster + WordNet 1.5 + PJC]
WordNet (r) 3.0 (2006):
v 1: exist beforehand or prior to a certain point in time; "Did
this condition pre-exist?"