Noun
Existence in a former state, or previous to something else.
Existence of the soul before its union with the body; -- a doctrine held by certain philosophers.
Source: Webster's dictionaryAccording to the preexistence theory, the soul exists before the moment of conception. Source: Internet
Maspero & Mateo Seco, p. 38 Gregory believed that the soul is created simultaneous to the creation of the body (in opposition to Origen, who believed in preexistence ), and that embryos were thus persons. Source: Internet