Coniunctio: "An alchemical symbol of a union of unlike substances; a marrying of the OPPOSITES in an intercourse which has as its fruition the birth of a new element. This is symbolised by a child that manifests potential for greater wholeness by recombining attributes of both the opposing natures.

https://callingourmothersnames.wordpr...

The coniunctio is the end result of the alchemical procedure when the opposites are sucessfully united. The psychological parallel to this, the broadening of consciousness that goes hand in hand with the process of individuation is the subject of Jung’s monumental study, Mysterium Coniunctionis.

The mystery of the coniunctio is that it is the joining of two into one, a holy marriage. According to Jung, “The coniunctio is an a priori image that occupies a prominent place in the history of man’s mental development. If we trace this idea back we find it has two sources in alchemy, one Christian, the other pagan. The Christian source is unmistakably the doctrine of Christ and the Church, sponsus and sponsa, where Christ takes the role of Sol and the Church that of Luna. The pagan source is on the one hand the hieros-gamos, on the other the marital union of the mystic with God. “The Psychology of the Transference,” (Jung, CW 16, pa. 355.)

We see then, that the coniunctio is not a physical union but rather a mental, internal state of being, a union of opposites, and in particular, the union of the conscious and unconscious. Jung described “a gradual transformation of the archetype into a psychological process which, in theory, we can call a combination of conscious and unconscious processes. (Carl Jung, CW 9i, para. 295)

https://pacifica.libguides.com/Jung/c...
https://www.kayegersch.com/the-coniun...
https://junginla.org/product/mystery-...