Synchronicity designates the parallelism of time and meaning between psychic and psychophysical events, which scientific knowledge so far has been unable to reduce to a common principle.
Jung’s canonical formulation defines synchronicity as meaningful parallelism between psychic and physical events irreducible to causality, positioning it as a new scientific and philosophical category distinct from both chance and causal law.
, The Structure and Dynamics of the Psyche, 1960thesis