The Collaborative International Dictionary
Preexistentism
Preexistentism \Pre`["e]x*ist"ent*ism\, n. (Philos.)
The theory of a pre["e]xistence of souls before their
association with human bodies.
--Emerson.
Wiktionary
preexistentism
n. (context philosophy English) The theory that souls exist prior to their association with human body.