The word 'synchronistic' is built upon the Greek elements syn- (together) and khronos (time), which combine to form the core concept of things occurring at the same time. The suffix -istic, via Latin -isticus and Greek -istikos, transforms the noun into an adjective, denoting a quality or characteristic. In its modern psychological and philosophical usage, pioneered by Carl Jung, the term evolved from the simple notion of simultaneity to describe a meaningful coincidence of events that are acausally connected. Thus, the literal "pertaining to being together in time" developed into the abstract principle that simultaneous occurrences can have a significant, non-causal relationship.

Structure: syn (together) + chron (time) + istic (adjective suffix) - syn: A prefix of Greek origin meaning "together, with, same". - chron: A combining form from Greek khronos, meaning "time". - istic: An adjective-forming suffix of Greek and Latin origin, meaning "pertaining to, characteristic of".