a Jungian concept in which human elements are simultaneously separate and unified, eliminating
disharmony on our journey to wholeness …or in Jungian terms, the pulse of the universe. The inner world of fantasy, imagination and dreams cross over into outer events. This ties into Jung’s Theory of Synchronicity as well (meaning acausal connection of two or more psycho-physic phenomena, or “meaningful coincidences,” by which the individual attains a greater understanding of self)
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via:
http://www.aphroditewomenshealth.com/xf2/threads/jung-unus-mundus-theory-of-synchronicity.11946/