synchronicity takes the coincidence of events in space and time as meaning something more than mere chance, namely, a peculiar interdependence of objective events among themselves as well as with the subjective (psychic) states of the observer
Jung’s canonical definition of synchronicity is articulated precisely against the concept of mere coincidence, upgrading it to ‘meaningful coincidence’ by positing a psychophysical interdependence irreducible to causality.
, Psychology and Religion: West and East, 1958thesis